v0.34.0: 27 synth waveforms, world drums, guitar strumming

16 dedicated instrument synths, speaker cab sim, analog drift,
strumming with fretboard lookup, dhol/dholak/mridangam/djembe/
metal kit with 22 patterns, 5 new demo moods.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,72 @@
 
 All notable changes to PyTheory are documented here.
 
+## 0.34.0
+
+- **16 dedicated instrument synths** — physical modeling and specialized
+  synthesis for: piano (hammer + steel strings + soundboard), bass guitar
+  (thick KS + pickup), flute (breath + tube resonance), trumpet (lip buzz
+  + bell), clarinet (odd harmonics + reed), oboe (double reed + conical
+  bore), marimba (inharmonic bar modes), harpsichord (quill pluck),
+  cello (deep bowed + body), harp (soft pluck + soundboard bloom),
+  upright bass (pizzicato + wooden body), acoustic guitar (KS + body
+  resonance), electric guitar (KS + pickup comb filter), sitar (jawari
+  + chikari), plus organ and bowed strings
+- **Speaker cabinet simulation** — tames distorted guitar fizz
+- **Guitar strumming** — `Part.strum("Am")` with fretboard lookup
+- **Analog oscillator drift** — subtle per-note pitch wobble on synth presets
+- **World percussion:** dhol, dholak, mridangam, djembe, metal kit
+  with 22 new drum patterns
+- **Piano improvements:** brightness scales with pitch, two-stage decay,
+  hammer impact with felt character
+- 27 synth waveforms, 10 envelopes, 40+ instrument presets, 80+ drum patterns
+
+## 0.33.1
+
+- **Electric guitar synth** — Karplus-Strong with magnetic pickup comb filter
+  simulation (single-coil honk, proper sustain)
+- **Speaker cabinet simulation** — steep rolloff above 4-5kHz with presence
+  bump. Makes distorted guitar sound warm instead of fizzy.
+- **6 guitar presets:** electric_guitar, clean_guitar, crunch_guitar,
+  distorted_guitar, orange_crunch, metal_guitar — all with proper cab sim
+- **Sitar synth** — Karplus-Strong with jawari bridge buzz, chikari
+  sympathetic strings, variable damping
+- **Guitar strumming** — `Part.strum("Am", Duration.HALF)` with
+  fretboard fingering lookup, down/up direction, adjustable strum speed
+- **World drums:** dhol (bhangra, chaal), dholak (qawwali, folk),
+  mridangam (adi talam, korvai), djembe (standard, kuku, soli)
+  — all with bandpass-filtered membrane noise for realistic drum head sound
+- **Metal drum kit** — clicky kick, bright snare, tight hats
+  with 4 patterns (double kick, metal blast, metal groove, metal gallop)
+- 15 synth waveforms, 10 envelopes, 40+ instrument presets
+
+## 0.33.0
+
+- **Non-12-TET support** — `TET(n)` factory creates any equal temperament
+- **11 microtonal systems:**
+  - `"shruti"` (22-TET Indian, 10 thaats with proper shruti intervals)
+  - `"maqam"` (24-TET Arabic, quarter-tone Rast/Bayati/Hijaz + 7 more)
+  - `"slendro"` (5-TET gamelan), `"pelog"` (9-TET gamelan with 3 pathet)
+  - `"thai"` (7-TET, 171 cents/step)
+  - `"makam"` (53-TET Turkish Arel-Ezgi-Uzdilek, 9 makams)
+  - `"carnatic"` (72-TET, 10 melakartas)
+  - `"19-tet"`, `"31-tet"` (historical Western)
+  - `"bohlen-pierce"` (13 divisions of the tritave 3:1 — non-octave!)
+- **Just intonation** — `temperament="just"` for pure 5-limit ratios
+- **Historical pitch** — `Score(reference_pitch=415.0)` for Baroque A=415
+- **`Score(system=, temperament=, reference_pitch=)`** flows through to all playback
+- Per-system `c_index` and `period` replace hardcoded constants
+- Fixed all hardcoded `12`s in tone arithmetic
+- Song #22: Greensleeves (Renaissance lute, meantone, A=415)
+- 22 new microtonal tests (819 total)
+
+## 0.32.1
+
+- `Tone("X")` now raises `ValueError` immediately instead of silently accepting invalid names (#39)
+- Support enharmonic spellings: `Cb`, `Fb`, `E#`, `B#` resolve correctly (#40)
+- Support double sharps (`C##`, `Fx`) and double flats (`Dbb`) via semitone arithmetic (#41)
+- Accept unicode music symbols: `♯` `♭` `𝄪` `𝄫`
+
 ## 0.32.0
 
 - **8 new synth engine features:**

examples/songs.py

@@ -1204,6 +1204,37 @@ def cinematic_showcase():
     play_song(score, "Cinematic Showcase — A minor")
 
 
+def greensleeves():
+    """Greensleeves — Renaissance lute, meantone tuning, A=415 Hz."""
+    score = Score("3/4", bpm=120, temperament="meantone", reference_pitch=415.0)
+
+    lute = score.part("lute", instrument="acoustic_guitar",
+                      reverb=0.3, reverb_type="taj_mahal")
+
+    melody = [
+        ("A4", 1.0, 80),
+        ("C5", 2.0, 85),   ("D5", 1.0, 80),
+        ("E5", 3.0, 90),
+        ("F5", 1.0, 75),   ("E5", 2.0, 85),
+        ("D5", 1.0, 80),
+        ("B4", 3.0, 85),
+        ("G4", 1.0, 70),   ("B4", 2.0, 80),
+        ("C5", 1.0, 75),
+        ("A4", 3.0, 85),
+        ("A4", 1.0, 70),   ("A4", 2.0, 75),
+        ("G#4", 1.0, 70),
+        ("A4", 2.0, 80),   ("B4", 1.0, 75),
+        ("G4", 3.0, 85),
+        ("E4", 1.0, 70),
+        ("A4", 3.0, 90),
+    ]
+
+    for note, dur, vel in melody:
+        lute.add(note, dur, velocity=vel)
+
+    play_song(score, "Greensleeves — Renaissance Lute (Meantone, A=415)")
+
+
 SONGS = {
     "1": ("Bossa Nova in A minor", bossa_nova_girl),
     "2": ("Bebop in Bb major", bebop_in_bb),
@@ -1226,6 +1257,7 @@ SONGS = {
     "19": ("Dance Party at the Reitz House", dance_party),
     "20": ("Temple Bell (Japanese)", temple_bell),
     "21": ("Cinematic Showcase (Orchestral)", cinematic_showcase),
+    "22": ("Greensleeves (Renaissance Lute)", greensleeves),
 }
 
 if __name__ == "__main__":
@@ -1239,7 +1271,7 @@ if __name__ == "__main__":
             print(f"    {key:>2}. {name}")
 
         print()
-        choice = input("  Pick a song (1-21, or 'all'): ").strip()
+        choice = input("  Pick a song (1-22, or 'all'): ").strip()
         print()
 
         if choice == "all":

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "pytheory"
-version = "0.32.0"
+version = "0.34.0"
 description = "Music Theory for Humans"
 readme = "README.md"
 license = "MIT"

pytheory/__init__.py

@@ -1,9 +1,9 @@
 """PyTheory: Music Theory for Humans."""
 
-__version__ = "0.32.0"
+__version__ = "0.34.0"
 
 from .tones import Tone, Interval
-from .systems import System, SYSTEMS
+from .systems import System, SYSTEMS, TET
 from .scales import TonedScale, Key, PROGRESSIONS
 from .chords import Chord, Fretboard, analyze_progression
 from .charts import CHARTS, Fingering, charts_for_fretboard
@@ -21,7 +21,7 @@ Scale = TonedScale
 __all__ = [
     "Tone", "Note", "Interval", "Scale", "TonedScale", "Key",
     "PROGRESSIONS", "Chord", "Fretboard", "Fingering", "analyze_progression",
-    "System", "SYSTEMS", "CHARTS", "charts_for_fretboard",
+    "System", "SYSTEMS", "TET", "CHARTS", "charts_for_fretboard",
     "play", "save", "save_midi", "play_progression", "play_pattern",
     "play_score", "Synth", "Envelope",
     "Duration", "TimeSignature", "RhythmNote", "Rest", "Score", "Part",

pytheory/_statics.py

@@ -6,10 +6,42 @@ REFERENCE_A = 440
 # Scientific pitch notation changes octave at C, not A, so this offset
 # is needed for all octave arithmetic.
 C_INDEX = 3
+def _create_just_intonation_scale(n):
+    """5-limit just intonation ratios for 12-tone systems.
+
+    These are the pure frequency ratios derived from the harmonic series —
+    the way intervals "want" to sound before equal temperament imposed
+    compromise. Each ratio is mathematically exact: a perfect fifth is
+    exactly 3/2, a major third is exactly 5/4.
+
+    For non-12 systems, falls back to equal temperament.
+    """
+    from fractions import Fraction
+    if n != 12:
+        return scales.create_edo_scale(n)
+    # Standard 5-limit JI ratios (A-based: A=1/1)
+    ratios = [
+        Fraction(1, 1),       # A  — unison
+        Fraction(16, 15),     # A# — minor second
+        Fraction(9, 8),       # B  — major second
+        Fraction(6, 5),       # C  — minor third
+        Fraction(5, 4),       # C# — major third
+        Fraction(4, 3),       # D  — perfect fourth
+        Fraction(45, 32),     # D# — augmented fourth
+        Fraction(3, 2),       # E  — perfect fifth
+        Fraction(8, 5),       # F  — minor sixth
+        Fraction(5, 3),       # F# — major sixth
+        Fraction(9, 5),       # G  — minor seventh
+        Fraction(15, 8),      # G# — major seventh
+        Fraction(2, 1),       # A  — octave
+    ]
+    return [float(r) for r in ratios]
+
 TEMPERAMENTS = {
     "equal": scales.create_edo_scale,
     "pythagorean": scales.create_pythagorean_scale,
     "meantone": scales.create_quarter_comma_meantone_scale,
+    "just": _create_just_intonation_scale,
 }
 
 TONES = {
@@ -220,6 +252,442 @@ INDIAN_SCALES = {
     }
 }
 
+# ── 22-shruti Indian system ──────────────────────────────────────────────────
+# The shruti system divides the octave into 22 microtonal steps, capturing
+# the melodic nuances that 12-TET cannot represent. Each of the 7 swaras
+# has multiple shruti positions (e.g. komal Re at shruti 2, shuddha Re at
+# shruti 4). 22-TET is the standard equal-tempered approximation.
+#
+# Ordered from Dha (=A) to match Western index positions (Sa at index 5 ≈ C).
+TONES_SHRUTI = [
+    ("Dha",),               #  0 — A  — shuddha dhaivat (reference = 440 Hz)
+    ("atikomal Ni",),       #  1 — shruti between Dha and komal Ni
+    ("komal Ni",),          #  2 — Bb — komal nishad
+    ("shuddha Ni",),        #  3 — between komal Ni and Ni
+    ("Ni",),                #  4 — B  — shuddha (kakali) nishad
+    ("Sa",),                #  5 — C  — shadja (tonic)
+    ("atikomal Re",),       #  6 — shruti between Sa and komal Re
+    ("komal Re",),          #  7 — Db — komal rishabh
+    ("shuddha Re",),        #  8 — between komal Re and Re
+    ("Re",),                #  9 — D  — chatushruti rishabh
+    ("atikomal Ga",),       # 10 — shruti between Re and komal Ga
+    ("komal Ga",),          # 11 — Eb — komal gandhar
+    ("Ga",),                # 12 — E  — antara gandhar
+    ("tivra Ga",),          # 13 — shruti between Ga and Ma
+    ("Ma",),                # 14 — F  — shuddha madhyam
+    ("ekashruti Ma",),      # 15 — shruti between Ma and tivra Ma
+    ("tivra Ma",),          # 16 — F# — tivra madhyam
+    ("atitivra Ma",),       # 17 — shruti between tivra Ma and Pa
+    ("Pa",),                # 18 — G  — pancham
+    ("atikomal Dha",),      # 19 — shruti between Pa and komal Dha
+    ("komal Dha",),         # 20 — Ab — komal dhaivat
+    ("shuddha Dha",),       # 21 — shruti between komal Dha and Dha
+]
+
+DEGREES_SHRUTI = [
+    ("shadja", ("bilawal",)),       # Sa — tonic
+    ("rishabh", ("marwa",)),        # Re
+    ("gandhar", ("bhairavi",)),     # Ga
+    ("madhyam", ("kalyan",)),       # Ma
+    ("pancham", ("kafi",)),         # Pa
+    ("dhaivat", ("asavari",)),      # Dha
+    ("nishad", ("khamaj",)),        # Ni
+    ("shadja", ()),                 # Sa (octave)
+]
+
+# 22-shruti thaat scales with proper microtonal intervals.
+# Each interval is counted in shrutis (22-TET steps).
+# Compare to the 12-TET approximations in INDIAN_SCALES which lose
+# the distinction between 2-shruti and 3-shruti steps.
+SHRUTI_SCALES = {
+    "chromatic": (22, {}),
+    "thaat": [
+        7,
+        {
+            # Bilawal (≈ Ionian) — Sa Re Ga Ma Pa Dha Ni
+            "bilawal": {"intervals": (4, 3, 2, 4, 4, 3, 2)},
+            # Khamaj (≈ Mixolydian) — Sa Re Ga Ma Pa Dha komal-Ni
+            "khamaj": {"intervals": (4, 3, 2, 4, 4, 1, 4)},
+            # Kafi (≈ Dorian) — Sa Re komal-Ga Ma Pa Dha komal-Ni
+            "kafi": {"intervals": (4, 2, 3, 4, 4, 1, 4)},
+            # Asavari (≈ Aeolian) — Sa Re komal-Ga Ma Pa komal-Dha komal-Ni
+            "asavari": {"intervals": (4, 2, 3, 4, 2, 3, 4)},
+            # Bhairavi (≈ Phrygian) — Sa komal-Re komal-Ga Ma Pa komal-Dha komal-Ni
+            "bhairavi": {"intervals": (2, 4, 3, 4, 2, 3, 4)},
+            # Bhairav — Sa komal-Re Ga Ma Pa komal-Dha Ni (unique to Indian music)
+            "bhairav": {"intervals": (2, 5, 2, 4, 2, 5, 2)},
+            # Kalyan (≈ Lydian) — Sa Re Ga tivra-Ma Pa Dha Ni
+            "kalyan": {"intervals": (4, 3, 4, 2, 4, 3, 2)},
+            # Marwa — Sa komal-Re Ga tivra-Ma Pa Dha Ni (unique)
+            "marwa": {"intervals": (2, 5, 4, 2, 4, 3, 2)},
+            # Poorvi — Sa komal-Re Ga tivra-Ma Pa komal-Dha Ni (unique)
+            "poorvi": {"intervals": (2, 5, 4, 2, 2, 5, 2)},
+            # Todi — Sa komal-Re komal-Ga tivra-Ma Pa komal-Dha Ni (unique)
+            "todi": {"intervals": (2, 4, 5, 2, 2, 5, 2)},
+        },
+    ],
+    "pentatonic": [
+        5,
+        {
+            # Bhupali (≈ major pentatonic) — Sa Re Ga Pa Dha
+            "bhupali": {"intervals": (4, 3, 6, 4, 5)},
+            # Malkauns — Sa komal-Ga Ma komal-Dha komal-Ni
+            "malkauns": {"intervals": (6, 3, 4, 5, 4)},
+            # Durga — Sa Re Ma Pa Dha
+            "durga": {"intervals": (4, 5, 4, 4, 5)},
+            # Bhairavi pentatonic — Sa komal-Re Ma Pa komal-Ni
+            "bhairavi pentatonic": {"intervals": (2, 7, 4, 2, 7)},
+        },
+    ],
+}
+
+# ── 24-TET Arabic maqam system ─────────────────────────────────────────────
+# Arabic maqam uses quarter-tones (half-flat, half-sharp). 24-TET captures
+# these intervals exactly. Each step = 50 cents (vs 100 in 12-TET).
+# The half-flat (♭½) is the defining sound of Arabic music — it's what
+# makes maqam Rast and Bayati sound distinctly Middle Eastern.
+#
+# Ordered from La (=A) to match Western index positions.
+TONES_ARABIC_24 = [
+    ("La",),                #  0 — A
+    ("La↑",),               #  1 — A quarter-sharp
+    ("Sib",),               #  2 — Bb
+    ("Si↓",),               #  3 — B quarter-flat
+    ("Si",),                #  4 — B
+    ("Do",),                #  5 — C
+    ("Do↑",),               #  6 — C quarter-sharp
+    ("Reb",),               #  7 — Db
+    ("Re↓",),               #  8 — D quarter-flat
+    ("Re",),                #  9 — D
+    ("Re↑",),               # 10 — D quarter-sharp
+    ("Mib",),               # 11 — Eb
+    ("Mi↓",),               # 12 — E quarter-flat
+    ("Mi",),                # 13 — E
+    ("Fa",),                # 14 — F
+    ("Fa↑",),               # 15 — F quarter-sharp
+    ("Fa#",),               # 16 — F#
+    ("Sol↓",),              # 17 — G quarter-flat
+    ("Sol",),               # 18 — G
+    ("Sol↑",),              # 19 — G quarter-sharp
+    ("Lab",),               # 20 — Ab
+    ("La↓",),               # 21 — A quarter-flat
+    ("La½b",),              # 22 — between Ab and A (rarely used)
+    ("La♮",),               # 23 — enharmonic A (rarely used)
+]
+
+DEGREES_ARABIC_24 = [
+    ("tonic", ()),
+    ("second", ()),
+    ("third", ()),
+    ("fourth", ()),
+    ("fifth", ()),
+    ("sixth", ()),
+    ("seventh", ()),
+    ("octave", ()),
+]
+
+# 24-TET maqam scales with true quarter-tone intervals.
+# Each step = 1 quarter-tone (50 cents). A 12-TET semitone = 2 steps.
+ARABIC_24_SCALES = {
+    "chromatic": (24, {}),
+    "maqam": [
+        7,
+        {
+            # Rast — the foundational maqam. E and B are quarter-flat.
+            # Do Re Mi↓ Fa Sol La Si↓ Do
+            "rast": {"intervals": (4, 3, 3, 4, 4, 3, 3)},
+            # Bayati — starts on D with quarter-flat 2nd.
+            # Re Mi↓ Fa Sol La Sib Do Re
+            "bayati": {"intervals": (3, 3, 4, 4, 2, 4, 4)},
+            # Saba — similar to Bayati with flattened 4th
+            "saba": {"intervals": (3, 3, 2, 6, 2, 4, 4)},
+            # Sikah — starts on E quarter-flat
+            "sikah": {"intervals": (3, 4, 3, 4, 3, 4, 3)},
+            # Hijaz — augmented 2nd (6 quarter-tones) between 2nd and 3rd
+            "hijaz": {"intervals": (2, 6, 2, 4, 2, 4, 4)},
+            # Nahawand (≈ harmonic minor)
+            "nahawand": {"intervals": (4, 2, 4, 4, 2, 6, 2)},
+            # Ajam (≈ major)
+            "ajam": {"intervals": (4, 4, 2, 4, 4, 4, 2)},
+            # Kurd (≈ Phrygian)
+            "kurd": {"intervals": (2, 4, 4, 4, 2, 4, 4)},
+            # Nikriz — augmented 2nd between 3rd and 4th
+            "nikriz": {"intervals": (4, 2, 6, 2, 4, 2, 4)},
+            # Jiharkah — like Rast but with natural B
+            "jiharkah": {"intervals": (4, 4, 2, 4, 4, 3, 3)},
+        },
+    ],
+}
+
+# ── 5-TET Gamelan Slendro ────────────────────────────────────────────────────
+# Slendro is a 5-tone equal temperament — each step is 240 cents.
+# The actual tuning varies between gamelans (each set is unique), but
+# 5-TET is the theoretical ideal that all slendro tunings approximate.
+# Ordered from nem (≈A) to loosely match Western indexing.
+TONES_SLENDRO = [
+    ("nem",),       # 0 — 6 (≈A)
+    ("ji",),        # 1 — 1 (≈C)
+    ("ro",),        # 2 — 2 (≈D)
+    ("lu",),        # 3 — 3 (≈F)
+    ("mo",),        # 4 — 5 (≈G)
+]
+
+DEGREES_SLENDRO = [
+    ("nem", ()), ("ji", ()), ("ro", ()), ("lu", ()), ("mo", ()),
+]
+
+SLENDRO_SCALES = {
+    "chromatic": (5, {}),
+    "pentatonic": [5, {
+        # The full slendro IS the pentatonic — all 5 tones
+        "slendro": {"intervals": (1, 1, 1, 1, 1)},
+    }],
+}
+
+# ── 9-TET Gamelan Pelog ─────────────────────────────────────────────────────
+# Pelog uses 7 tones from a roughly 9-step division of the octave.
+# 9-TET (133 cents/step) approximates the unequal pelog intervals.
+# The 3 pathet (modes) select 5 tones from the 7.
+TONES_PELOG = [
+    ("nem",),       # 0 — 6
+    ("pi",),        # 1 — 7
+    ("ji",),        # 2 — 1
+    ("ro",),        # 3 — 2
+    ("lu",),        # 4 — 3
+    ("pat",),       # 5 — 4
+    ("barang",),    # 6 — complementary
+    ("mo",),        # 7 — 5
+    ("nem+",),      # 8 — auxiliary
+]
+
+DEGREES_PELOG = [
+    ("nem", ()), ("pi", ()), ("ji", ()), ("ro", ()),
+    ("lu", ()), ("pat", ()), ("barang", ()), ("mo", ()), ("nem+", ()),
+]
+
+PELOG_SCALES = {
+    "chromatic": (9, {}),
+    "heptatonic": [7, {
+        # Full pelog — 7 tones from 9 steps
+        "pelog": {"intervals": (1, 2, 1, 1, 2, 1, 1)},
+    }],
+    "pentatonic": [5, {
+        # Pathet nem — the most common mode
+        "pelog nem": {"intervals": (1, 2, 2, 2, 2)},
+        # Pathet lima
+        "pelog lima": {"intervals": (1, 2, 2, 1, 3)},
+        # Pathet barang
+        "pelog barang": {"intervals": (2, 1, 2, 2, 2)},
+    }],
+}
+
+# ── 7-TET Thai classical ────────────────────────────────────────────────────
+# Thai classical music divides the octave into 7 exactly equal steps
+# (~171 cents each). This is unique — no Western equivalent exists.
+# The 7 tones are numbered 1-7 in Thai theory.
+TONES_THAI = [
+    ("do",),        # 0 — 1st degree
+    ("re",),        # 1 — 2nd
+    ("mi",),        # 2 — 3rd
+    ("fa",),        # 3 — 4th
+    ("sol",),       # 4 — 5th
+    ("la",),        # 5 — 6th
+    ("si",),        # 6 — 7th
+]
+
+DEGREES_THAI = [
+    ("thang 1", ()), ("thang 2", ()), ("thang 3", ()),
+    ("thang 4", ()), ("thang 5", ()), ("thang 6", ()), ("thang 7", ()),
+]
+
+THAI_SCALES = {
+    "chromatic": (7, {}),
+    "pentatonic": [5, {
+        # The standard Thai pentatonic — 5 of 7 equal steps
+        "thai pentatonic": {"intervals": (1, 1, 2, 1, 2)},
+        # Alternate selection
+        "thai pentatonic 2": {"intervals": (2, 1, 1, 2, 1)},
+    }],
+    "heptatonic": [7, {
+        # The full 7-TET scale
+        "thai": {"intervals": (1, 1, 1, 1, 1, 1, 1)},
+    }],
+}
+
+# ── 53-TET Turkish makam (Arel-Ezgi-Uzdilek) ───────────────────────────────
+# The gold standard for Turkish music theory. 53-TET has nearly perfect
+# fifths (31 steps = 701.89 cents vs 701.96 just) and excellent thirds.
+# A comma (1 step) = 22.6 cents. The basic intervals:
+#   Bakiye (B) = 4 commas ≈ 90 cents (like a limma)
+#   Küçük mücenneb (S) = 5 commas ≈ 113 cents
+#   Büyük mücenneb (K) = 8 commas ≈ 181 cents
+#   Tanini (T) = 9 commas ≈ 204 cents (like a whole tone)
+TONES_TURKISH = [
+    ("La",),                #  0 — A (Dügah reference)
+    ("La+1",),              #  1
+    ("La+2",),              #  2
+    ("La+3",),              #  3
+    ("Sib",),               #  4 — Bb (4 commas from A)
+    ("Sib+1",),             #  5
+    ("Sib+2",),             #  6
+    ("Sib+3",),             #  7
+    ("Sib+4",),             #  8
+    ("Si",),                #  9 — B
+    ("Si+1",),              # 10
+    ("Si+2",),              # 11
+    ("Si+3",),              # 12
+    ("Do",),                # 13 — C (Rast)
+    ("Do+1",),              # 14
+    ("Do+2",),              # 15
+    ("Do+3",),              # 16
+    ("Do+4",),              # 17
+    ("Reb",),               # 18 — Db
+    ("Reb+1",),             # 19
+    ("Reb+2",),             # 20
+    ("Reb+3",),             # 21
+    ("Re",),                # 22 — D (Dügah)
+    ("Re+1",),              # 23
+    ("Re+2",),              # 24
+    ("Re+3",),              # 25
+    ("Re+4",),              # 26
+    ("Mib",),               # 27 — Eb
+    ("Mib+1",),             # 28
+    ("Mib+2",),             # 29
+    ("Mib+3",),             # 30
+    ("Mi",),                # 31 — E (Segah)
+    ("Mi+1",),              # 32
+    ("Mi+2",),              # 33
+    ("Mi+3",),              # 34
+    ("Mi+4",),              # 35
+    ("Fa",),                # 36 — F
+    ("Fa+1",),              # 37
+    ("Fa+2",),              # 38
+    ("Fa+3",),              # 39
+    ("Fa#",),               # 40 — F#
+    ("Fa#+1",),             # 41
+    ("Fa#+2",),             # 42
+    ("Fa#+3",),             # 43
+    ("Sol",),               # 44 — G (Neva)
+    ("Sol+1",),             # 45
+    ("Sol+2",),             # 46
+    ("Sol+3",),             # 47
+    ("Lab",),               # 48 — Ab
+    ("Lab+1",),             # 49
+    ("Lab+2",),             # 50
+    ("Lab+3",),             # 51
+    ("Lab+4",),             # 52
+]
+
+DEGREES_TURKISH = [(f"perde {i+1}", ()) for i in range(53)]
+
+# Turkish makam scales in 53-TET commas.
+# T=9 commas (whole tone), S=5 (small), K=8 (large), B=4 (limma)
+TURKISH_SCALES = {
+    "chromatic": (53, {}),
+    "makam": [
+        7,
+        {
+            # Rast — the foundational makam. Uses segah (≈ neutral 3rd)
+            # T + T + S + T + T + T + S = 9+9+5+9+9+9+4 = 53...
+            # Actually: 9+8+5+9+9+8+5 = 53
+            "rast": {"intervals": (9, 8, 5, 9, 9, 8, 5)},
+            # Nihavend (≈ harmonic minor)
+            "nihavend": {"intervals": (9, 4, 9, 9, 4, 13, 5)},
+            # Hicaz — the augmented 2nd makam
+            "hicaz": {"intervals": (5, 12, 5, 9, 4, 9, 9)},
+            # Ussak — one of the most common makams
+            "ussak": {"intervals": (8, 5, 9, 9, 8, 5, 9)},
+            # Huseyni
+            "huseyni": {"intervals": (8, 5, 9, 9, 5, 8, 9)},
+            # Kurdi (≈ Phrygian)
+            "kurdi": {"intervals": (4, 9, 9, 9, 4, 9, 9)},
+            # Segah — starts on the neutral 3rd
+            "segah": {"intervals": (5, 9, 9, 8, 5, 9, 8)},
+            # Saba — descending differs from ascending
+            "saba": {"intervals": (8, 5, 4, 14, 4, 9, 9)},
+            # Hüzzam
+            "huzzam": {"intervals": (5, 9, 8, 5, 9, 8, 9)},
+        },
+    ],
+}
+
+# ── 72-TET Carnatic (South Indian) ───────────────────────────────────────────
+# The 72 melakarta system classifies all possible 7-note scales with
+# fixed Sa and Pa. 72-TET (16.67 cents/step) captures the srutis used
+# in Carnatic music with high precision. Each 12-TET semitone = 6 steps.
+#
+# Tone names: 12 swaras × 6 microtonal variants each.
+# Main swaras at positions: Sa=0, Ri1=6, Ri2=12, Ga1=12, Ga2=18,
+# Ma1=30, Ma2=36, Pa=42, Da1=48, Da2=54, Ni1=60, Ni2=66
+TONES_CARNATIC = []
+_SWARA_NAMES = [
+    "Sa", "atikomal Ri", "komal Ri", "shuddha Ri",
+    "Ri", "tivra Ri", "komal Ga", "atikomal Ga",
+    "Ga", "shuddha Ga", "tivra Ga", "antara Ga",
+    "komal Ma", "shuddha Ma", "Ma", "tivra shuddha Ma",
+    "ekashruti Ma", "chatushruti Ma", "tivra Ma", "atitivra Ma",
+    "prati Ma", "tivratara Ma", "atikomal Pa-", "komal Pa-",
+    "shuddha Pa-", "Pa-", "Pa-+1", "Pa-+2",
+    "Pa-+3", "Pa-+4", "Pa", "Pa+1",
+    "Pa+2", "Pa+3", "Pa+4", "Pa+5",
+    "komal Da", "atikomal Da", "Da-", "shuddha Da-",
+    "Da", "shuddha Da", "tivra Da", "atitivra Da",
+    "komal Ni", "atikomal Ni", "Ni-", "shuddha Ni-",
+    "Ni", "shuddha Ni", "tivra Ni", "chatushruti Ni",
+    "kakali Ni", "atikakali Ni",
+]
+# Generate 72 tone names: use standard names for the 12 main positions,
+# numbered variants for the intermediates
+for i in range(72):
+    main_pos = i // 6  # which semitone group (0-11)
+    micro = i % 6      # microtonal position within group
+    _base_names = ["Sa", "komal Ri", "Ri", "komal Ga", "Ga", "Ma",
+                   "tivra Ma", "Pa", "komal Da", "Da", "komal Ni", "Ni"]
+    if micro == 0:
+        TONES_CARNATIC.append((_base_names[main_pos],))
+    else:
+        TONES_CARNATIC.append((f"{_base_names[main_pos]}+{micro}",))
+
+DEGREES_CARNATIC = [(f"swara {i+1}", ()) for i in range(72)]
+
+# A selection of important melakartas in 72-TET intervals.
+# Each step = 1/72 of an octave ≈ 16.67 cents.
+CARNATIC_SCALES = {
+    "chromatic": (72, {}),
+    "melakarta": [
+        7,
+        {
+            # Kanakangi (melakarta 1) — Sa Ri1 Ga1 Ma1 Pa Da1 Ni1
+            "kanakangi": {"intervals": (6, 6, 18, 12, 6, 6, 18)},
+            # Shankarabharanam (melakarta 29) — Sa Ri2 Ga3 Ma1 Pa Da2 Ni3
+            # The Carnatic equivalent of the major scale
+            "shankarabharanam": {"intervals": (12, 12, 6, 12, 12, 12, 6)},
+            # Kalyani (melakarta 65) — Sa Ri2 Ga3 Ma2 Pa Da2 Ni3
+            # Carnatic Lydian equivalent
+            "kalyani": {"intervals": (12, 12, 12, 6, 12, 12, 6)},
+            # Kharaharapriya (melakarta 22) — Sa Ri2 Ga2 Ma1 Pa Da2 Ni2
+            # Carnatic Dorian equivalent
+            "kharaharapriya": {"intervals": (12, 6, 12, 12, 12, 6, 12)},
+            # Hanumathodi (melakarta 8) — Sa Ri1 Ga2 Ma1 Pa Da1 Ni2
+            # Carnatic Phrygian equivalent
+            "hanumathodi": {"intervals": (6, 12, 12, 12, 6, 12, 12)},
+            # Natabhairavi (melakarta 20) — Sa Ri2 Ga2 Ma1 Pa Da1 Ni2
+            # Natural minor equivalent
+            "natabhairavi": {"intervals": (12, 6, 12, 12, 6, 12, 12)},
+            # Mayamalavagowla (melakarta 15) — Sa Ri1 Ga3 Ma1 Pa Da1 Ni3
+            # The "lesson scale" — first raga taught to students
+            "mayamalavagowla": {"intervals": (6, 18, 6, 12, 6, 18, 6)},
+            # Simhendramadhyamam (melakarta 57) — Sa Ri2 Ga3 Ma2 Pa Da1 Ni3
+            "simhendramadhyamam": {"intervals": (12, 12, 12, 6, 6, 18, 6)},
+            # Charukesi (melakarta 26) — Sa Ri2 Ga3 Ma1 Pa Da1 Ni2
+            "charukesi": {"intervals": (12, 12, 6, 12, 6, 12, 12)},
+            # Harikambhoji (melakarta 28) — Sa Ri2 Ga3 Ma1 Pa Da2 Ni2
+            # Mixolydian equivalent
+            "harikambhoji": {"intervals": (12, 12, 6, 12, 12, 6, 12)},
+        },
+    ],
+}
+
 # Arabic maqam scales (12-TET approximations).
 # True maqam uses quarter-tones; these are the closest 12-tone equivalents.
 ARABIC_SCALES = {

pytheory/cli.py

@@ -275,6 +275,30 @@ def cmd_demo(args):
          "lead": ("pluck_synth", "none", 0.3, 0.2),
          "pad": ("strings_synth", "pad", 0.0),
          "bass_lp": 200, "reverb_type": "taj_mahal"},
+        {"name": "Classical", "key": ("D", "minor"), "drums": "bolero",
+         "fill": "bossa nova", "bpm": 72,
+         "prog": ("i", "iv", "V", "i"),
+         "lead": ("flute_synth", "strings", 0.35, 0.2),
+         "pad": ("cello_synth", "bowed", -0.2),
+         "bass_lp": 400, "reverb_type": "cathedral"},
+        {"name": "Harpsichord Suite", "key": ("A", "minor"), "drums": "bolero",
+         "fill": "bossa nova", "bpm": 92,
+         "prog": ("i", "iv", "V", "i"),
+         "lead": ("harpsichord_synth", "none", 0.2, 0.1),
+         "pad": ("strings_synth", "pad", -0.3),
+         "bass_lp": 500, "reverb_type": "plate"},
+        {"name": "Bhangra", "key": ("G", "minor"), "drums": "bhangra",
+         "fill": "rock", "bpm": 140,
+         "prog": ("i", "iv", "V", "i"),
+         "lead": ("sitar_synth", "none", 0.3, 0.2),
+         "pad": ("strings_synth", "pad", 0.0),
+         "bass_lp": 400, "reverb_type": "taj_mahal"},
+        {"name": "Jazz Trio", "key": ("F", "major"), "drums": "swing",
+         "fill": "jazz", "bpm": 100,
+         "prog": ("I", "vi", "ii", "V"),
+         "lead": ("trumpet_synth", "bowed", 0.3, 0.2),
+         "pad": ("piano_synth", "none", -0.2),
+         "bass_lp": 600, "reverb_type": "plate"},
     ]
 
     mood = random.choice(moods)

pytheory/rhythm.py

@@ -14,11 +14,8 @@ from typing import Optional
 INSTRUMENTS = {
     # ── Keys ──
     "piano": {
-        "synth": "fm", "envelope": "piano",
-        "fm_ratio": 1.0, "fm_index": 1.5,
-        "detune": 5, "chorus": 0.1, "chorus_rate": 0.3,
-        "lowpass": 6000, "saturation": 0.1,
-        "vel_to_filter": 3000, "noise_mix": 0.02,
+        "synth": "piano_synth", "envelope": "none",
+        "vel_to_filter": 3000,
     },
     "electric_piano": {  # Rhodes/Wurlitzer
         "synth": "fm", "envelope": "piano",
@@ -26,16 +23,17 @@ INSTRUMENTS = {
         "detune": 6, "chorus": 0.2, "chorus_rate": 1.0,
         "lowpass": 4000, "saturation": 0.15,
         "tremolo_depth": 0.15, "tremolo_rate": 4.5,
+        "analog": 0.2,
     },
     "organ": {
         "synth": "organ_synth", "envelope": "organ",
         "chorus": 0.2, "chorus_rate": 5.5,
         "lowpass": 5000,
         "phaser": 0.15, "phaser_rate": 0.4,
+        "analog": 0.15,
     },
     "harpsichord": {
-        "synth": "pluck_synth", "envelope": "none",
-        "lowpass": 3500,
+        "synth": "harpsichord_synth", "envelope": "none",
     },
     "celesta": {
         "synth": "fm", "envelope": "mallet",
@@ -63,10 +61,8 @@ INSTRUMENTS = {
         "noise_mix": 0.03,
     },
     "cello": {
-        "synth": "strings_synth", "envelope": "bowed",
-        "detune": 2, "lowpass": 2500,
+        "synth": "cello_synth", "envelope": "bowed",
         "humanize": 0.15, "vel_to_filter": 1000,
-        "noise_mix": 0.02,
     },
     "contrabass": {
         "synth": "strings_synth", "envelope": "bowed",
@@ -84,21 +80,18 @@ INSTRUMENTS = {
 
     # ── Woodwinds ──
     "flute": {
-        "synth": "sine", "envelope": "strings",
-        "lowpass": 4000,
-        "humanize": 0.2, "noise_mix": 0.08,
+        "synth": "flute_synth", "envelope": "strings",
+        "humanize": 0.2,
         "vel_to_filter": 2000,
     },
     "clarinet": {
-        "synth": "square", "envelope": "strings",
-        "lowpass": 3000,
-        "humanize": 0.15, "noise_mix": 0.05,
+        "synth": "clarinet_synth", "envelope": "strings",
+        "humanize": 0.15,
         "vel_to_filter": 1500,
     },
     "oboe": {
-        "synth": "saw", "envelope": "strings",
-        "lowpass": 3500, "lowpass_q": 1.2,
-        "humanize": 0.15, "noise_mix": 0.04,
+        "synth": "oboe_synth", "envelope": "strings",
+        "humanize": 0.15,
         "vel_to_filter": 1000,
     },
     "bassoon": {
@@ -110,16 +103,13 @@ INSTRUMENTS = {
 
     # ── Brass ──
     "trumpet": {
-        "synth": "saw", "envelope": "bowed",
-        "detune": 3, "lowpass": 4000, "lowpass_q": 1.1,
+        "synth": "trumpet_synth", "envelope": "bowed",
         "humanize": 0.15, "vel_to_filter": 2000,
-        "saturation": 0.1,
     },
     "trombone": {
-        "synth": "saw", "envelope": "strings",
-        "detune": 3, "lowpass": 2500,
+        "synth": "trumpet_synth", "envelope": "strings",
+        "lowpass": 2500,
         "humanize": 0.15, "vel_to_filter": 1500,
-        "saturation": 0.1,
     },
     "french_horn": {
         "synth": "saw", "envelope": "strings",
@@ -143,34 +133,61 @@ INSTRUMENTS = {
 
     # ── Plucked ──
     "acoustic_guitar": {
-        "synth": "pluck_synth", "envelope": "none",
-        "lowpass": 4000,
-        "humanize": 0.2,
+        "synth": "acoustic_guitar_synth", "envelope": "none",
+        "humanize": 0.2, "saturation": 0.05,
     },
     "electric_guitar": {
-        "synth": "saw", "envelope": "pluck",
-        "detune": 5, "lowpass": 3500,
+        "synth": "electric_guitar_synth", "envelope": "none",
+        "cabinet": 1.0, "cabinet_brightness": 0.6,
+        "humanize": 0.15,
+    },
+    "clean_guitar": {
+        "synth": "electric_guitar_synth", "envelope": "none",
+        "cabinet": 1.0, "cabinet_brightness": 0.7,
+        "chorus": 0.15, "chorus_rate": 1.0,
+        "reverb": 0.2, "reverb_type": "spring",
+        "humanize": 0.15,
+    },
+    "crunch_guitar": {
+        "synth": "electric_guitar_synth", "envelope": "none",
+        "saturation": 0.3,
+        "distortion": 0.5, "distortion_drive": 4.0,
+        "cabinet": 1.0, "cabinet_brightness": 0.5,
         "humanize": 0.15,
     },
     "distorted_guitar": {
-        "synth": "saw", "envelope": "pluck",
-        "detune": 8, "distortion": 0.6, "distortion_drive": 5.0,
-        "lowpass": 3000, "saturation": 0.3,
+        "synth": "electric_guitar_synth", "envelope": "none",
+        "saturation": 0.3,
+        "distortion": 0.7, "distortion_drive": 5.0,
+        "cabinet": 1.0, "cabinet_brightness": 0.5,
         "humanize": 0.15,
     },
+    "orange_crunch": {
+        "synth": "electric_guitar_synth", "envelope": "none",
+        "saturation": 0.4,
+        "distortion": 0.7, "distortion_drive": 6.0,
+        "cabinet": 1.0, "cabinet_brightness": 0.4,
+        "humanize": 0.15,
+    },
+    "metal_guitar": {
+        "synth": "electric_guitar_synth", "envelope": "none",
+        "saturation": 0.35,
+        "distortion": 0.8, "distortion_drive": 7.0,
+        "cabinet": 1.0, "cabinet_brightness": 0.5,
+        "highpass": 80,
+        "detune": 4,
+        "humanize": 0.1,
+    },
     "bass_guitar": {
-        "synth": "triangle", "envelope": "pluck",
-        "lowpass": 1000,
-        "humanize": 0.1, "sub_osc": 0.2,
+        "synth": "bass_guitar_synth", "envelope": "none",
+        "humanize": 0.1, "sub_osc": 0.15,
     },
     "upright_bass": {
-        "synth": "triangle", "envelope": "pluck",
-        "lowpass": 800,
+        "synth": "upright_bass_synth", "envelope": "none",
         "humanize": 0.15, "saturation": 0.1,
     },
     "harp": {
-        "synth": "pluck_synth", "envelope": "none",
-        "lowpass": 5000,
+        "synth": "harp_synth", "envelope": "none",
         "reverb": 0.3, "reverb_type": "plate",
     },
     "sitar": {
@@ -183,6 +200,11 @@ INSTRUMENTS = {
         "lowpass": 4000,
         "reverb": 0.2,
     },
+    "sitar": {
+        "synth": "sitar_synth", "envelope": "none",
+        "lowpass": 4500,
+        "humanize": 0.2,
+    },
 
     # ── Synth presets ──
     "synth_lead": {
@@ -191,6 +213,7 @@ INSTRUMENTS = {
         "delay": 0.2, "delay_time": 0.25, "delay_feedback": 0.3,
         "filter_attack": 0.01, "filter_decay": 0.3,
         "filter_sustain": 0.2, "filter_amount": 3000,
+        "analog": 0.3,
     },
     "synth_pad": {
         "synth": "supersaw", "envelope": "pad",
@@ -198,6 +221,7 @@ INSTRUMENTS = {
         "chorus": 0.2,
         "phaser": 0.3, "phaser_rate": 0.3,
         "sub_osc": 0.2,
+        "analog": 0.4,
     },
     "synth_bass": {
         "synth": "saw", "envelope": "pluck",
@@ -205,6 +229,7 @@ INSTRUMENTS = {
         "filter_attack": 0.005, "filter_decay": 0.2,
         "filter_sustain": 0.0, "filter_amount": 2000,
         "sub_osc": 0.4,
+        "analog": 0.2,
     },
     "acid_bass": {
         "synth": "saw", "envelope": "pad",
@@ -214,6 +239,7 @@ INSTRUMENTS = {
         "filter_attack": 0.005, "filter_decay": 0.15,
         "filter_sustain": 0.0, "filter_amount": 4000,
         "vel_to_filter": 3000,
+        "analog": 0.3,
     },
     "808_bass": {
         "synth": "sine", "envelope": "pluck",
@@ -231,8 +257,7 @@ INSTRUMENTS = {
         "reverb": 0.3, "reverb_type": "plate",
     },
     "marimba": {
-        "synth": "sine", "envelope": "mallet",
-        "lowpass": 3000,
+        "synth": "marimba_synth", "envelope": "mallet",
     },
     "xylophone": {
         "synth": "fm", "envelope": "pluck",
@@ -376,6 +401,34 @@ class DrumSound(Enum):
     AGOGO_LOW = 68
     GUIRO = 73
     MARACAS = 70
+    # Tabla sounds
+    TABLA_NA = 86       # sharp dayan (right drum) rim hit
+    TABLA_TIN = 87      # open dayan ring
+    TABLA_GE = 88       # deep bayan (left drum) bass
+    TABLA_DHA = 89      # both drums (Na + Ge)
+    TABLA_TIT = 90      # light dayan flick
+    TABLA_KE = 91       # muted bayan slap
+    # Dhol sounds
+    DHOL_DAGGA = 92     # heavy bass side (dagga stick)
+    DHOL_TILLI = 93     # thin treble side (tilli stick)
+    DHOL_BOTH = 94      # both sides
+    # Dholak sounds
+    DHOLAK_GE = 95      # bass side (open palm)
+    DHOLAK_NA = 96      # treble side (fingers)
+    DHOLAK_TIT = 97     # light treble tap
+    # Mridangam sounds
+    MRIDANGAM_THAM = 98  # bass stroke (thoppi/left head)
+    MRIDANGAM_NAM = 99   # treble ring (valanthalai/right head)
+    MRIDANGAM_DIN = 100  # both heads
+    MRIDANGAM_THA = 101  # muted treble
+    # Djembe sounds
+    DJEMBE_BASS = 102    # open bass (center of head)
+    DJEMBE_TONE = 103    # open tone (edge, fingers together)
+    DJEMBE_SLAP = 104    # slap (edge, fingers spread, sharp crack)
+    # Metal kit — tighter, punchier, more attack
+    METAL_KICK = 105     # clicky, punchy, tight
+    METAL_SNARE = 106    # crack, bright, cutting
+    METAL_HAT = 107      # tight, short, precise
 
 
 class _Hit:
@@ -1313,6 +1366,314 @@ Pattern._PRESETS["flamenco"] = dict(
     ],
 )
 
+# ── Tabla patterns ────────────────────────────────────────────────────────
+# Shortcuts for tabla sounds
+TNA = DrumSound.TABLA_NA
+TTI = DrumSound.TABLA_TIN
+TGE = DrumSound.TABLA_GE
+TDHA = DrumSound.TABLA_DHA
+TTIT = DrumSound.TABLA_TIT
+TKE = DrumSound.TABLA_KE
+
+# Teental — the most common taal (16 beats / 4+4+4+4)
+Pattern._PRESETS["teental"] = dict(
+    name="teental",
+    time_signature="4/4",
+    beats=16.0,
+    hits=[
+        # Vibhag 1: Dha Dhin Dhin Dha
+        _h(TDHA, 0.0), _h(TNA, 1.0), _h(TNA, 2.0), _h(TDHA, 3.0),
+        # Vibhag 2: Dha Dhin Dhin Dha
+        _h(TDHA, 4.0), _h(TNA, 5.0), _h(TNA, 6.0), _h(TDHA, 7.0),
+        # Vibhag 3 (khali): Dha Tin Tin Ta
+        _h(TDHA, 8.0), _h(TTI, 9.0), _h(TTI, 10.0), _h(TNA, 11.0),
+        # Vibhag 4: Dha Dhin Dhin Dha
+        _h(TDHA, 12.0), _h(TNA, 13.0), _h(TNA, 14.0), _h(TDHA, 15.0),
+    ],
+)
+
+# Jhaptaal — 10 beats (2+3+2+3)
+Pattern._PRESETS["jhaptaal"] = dict(
+    name="jhaptaal",
+    time_signature="4/4",
+    beats=10.0,
+    hits=[
+        # Dhi Na | Dhi Dhi Na | Ti Na | Dhi Dhi Na
+        _h(TDHA, 0.0), _h(TNA, 1.0),
+        _h(TDHA, 2.0), _h(TDHA, 3.0), _h(TNA, 4.0),
+        _h(TTI, 5.0), _h(TNA, 6.0),
+        _h(TDHA, 7.0), _h(TDHA, 8.0), _h(TNA, 9.0),
+    ],
+)
+
+# Rupak taal — 7 beats (3+2+2), starts on khali (unusual)
+Pattern._PRESETS["rupak"] = dict(
+    name="rupak",
+    time_signature="7/4",
+    beats=7.0,
+    hits=[
+        # Tin Tin Na | Dhi Na | Dhi Na
+        _h(TTI, 0.0), _h(TTI, 1.0), _h(TNA, 2.0),
+        _h(TDHA, 3.0), _h(TNA, 4.0),
+        _h(TDHA, 5.0), _h(TNA, 6.0),
+    ],
+)
+
+# Dadra — 6 beats (3+3), light and folk
+Pattern._PRESETS["dadra"] = dict(
+    name="dadra",
+    time_signature="6/4",
+    beats=6.0,
+    hits=[
+        # Dha Dhi Na | Dha Tin Na
+        _h(TDHA, 0.0), _h(TNA, 1.0), _h(TNA, 2.0),
+        _h(TDHA, 3.0), _h(TTI, 4.0), _h(TNA, 5.0),
+    ],
+)
+
+# Keherwa — 8 beats (4+4), the most common light taal
+Pattern._PRESETS["keherwa"] = dict(
+    name="keherwa",
+    time_signature="4/4",
+    beats=8.0,
+    hits=[
+        # Dha Ge Na Ti | Na Ke Dhi Na
+        _h(TDHA, 0.0), _h(TGE, 1.0), _h(TNA, 2.0), _h(TTIT, 3.0),
+        _h(TNA, 4.0), _h(TKE, 5.0), _h(TDHA, 6.0), _h(TNA, 7.0),
+    ],
+)
+
+# Tabla solo theka — fast 16th note pattern for rhythmic display
+Pattern._PRESETS["tabla solo"] = dict(
+    name="tabla solo",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(TDHA, 0.0), _h(TTIT, 0.25), _h(TTIT, 0.5), _h(TKE, 0.75),
+        _h(TNA, 1.0), _h(TTIT, 1.25), _h(TGE, 1.5), _h(TNA, 1.75),
+        _h(TDHA, 2.0), _h(TNA, 2.25), _h(TTI, 2.5), _h(TNA, 2.75),
+        _h(TDHA, 3.0), _h(TTIT, 3.5), _h(TGE, 3.75),
+    ],
+)
+
+# ── Metal kit patterns ────────────────────────────────────────────────────
+MK = DrumSound.METAL_KICK
+MS = DrumSound.METAL_SNARE
+MH = DrumSound.METAL_HAT
+
+# Metal double kick — the classic thrash/death metal beat
+Pattern._PRESETS["double kick"] = dict(
+    name="double kick",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        # Double kick 16ths, snare on 2 and 4, tight hats
+        *[_h(MK, i * 0.25) for i in range(16)],
+        _h(MS, 1.0), _h(MS, 3.0),
+        *[_h(MH, i * 0.5) for i in range(8)],
+    ],
+)
+
+# Metal blast — blast beat with metal kit sounds
+Pattern._PRESETS["metal blast"] = dict(
+    name="metal blast",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        *[_h(MK, i * 0.25) for i in range(16)],
+        *[_h(MS, i * 0.25) for i in range(16)],
+        *[_h(MH, i * 0.25) for i in range(16)],
+    ],
+)
+
+# Metal groove — half time with double kick fills
+Pattern._PRESETS["metal groove"] = dict(
+    name="metal groove",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(MK, 0.0), _h(MH, 0.0),
+        _h(MH, 0.5),
+        _h(MS, 1.0), _h(MH, 1.0),
+        _h(MK, 1.5), _h(MH, 1.5),
+        _h(MK, 2.0), _h(MH, 2.0),
+        _h(MK, 2.25),
+        _h(MK, 2.5), _h(MH, 2.5),
+        _h(MK, 2.75),
+        _h(MS, 3.0), _h(MH, 3.0),
+        _h(MH, 3.5),
+    ],
+)
+
+# Metal gallop — the classic Iron Maiden triplet feel
+Pattern._PRESETS["metal gallop"] = dict(
+    name="metal gallop",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(MK, 0.0), _h(MH, 0.0),
+        _h(MK, 0.33), _h(MK, 0.67),
+        _h(MS, 1.0), _h(MH, 1.0),
+        _h(MK, 1.33), _h(MK, 1.67),
+        _h(MK, 2.0), _h(MH, 2.0),
+        _h(MK, 2.33), _h(MK, 2.67),
+        _h(MS, 3.0), _h(MH, 3.0),
+        _h(MK, 3.33), _h(MK, 3.67),
+    ],
+)
+
+# Tabla tiri-kita — rapid 16th-note dayan patter
+Pattern._PRESETS["tiri kita"] = dict(
+    name="tiri kita",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        # Ti ri ki ta | dha ti ri ki | ta ka dhi na | dha — ti dha
+        _h(TTIT, 0.0), _h(TTIT, 0.25), _h(TKE, 0.5), _h(TNA, 0.75),
+        _h(TDHA, 1.0), _h(TTIT, 1.25), _h(TTIT, 1.5), _h(TKE, 1.75),
+        _h(TNA, 2.0), _h(TKE, 2.25), _h(TDHA, 2.5), _h(TNA, 2.75),
+        _h(TDHA, 3.0), _h(TTIT, 3.5), _h(TDHA, 3.75),
+    ],
+)
+
+# ── Dhol patterns ────────────────────────────────────────────────────────
+DD = DrumSound.DHOL_DAGGA
+DT = DrumSound.DHOL_TILLI
+DB = DrumSound.DHOL_BOTH
+
+# Bhangra — the classic punjabi groove
+Pattern._PRESETS["bhangra"] = dict(
+    name="bhangra",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        # Dagga on 1, tilli fills, both on 3
+        _h(DD, 0.0), _h(DT, 0.5), _h(DT, 0.75),
+        _h(DT, 1.0), _h(DT, 1.5),
+        _h(DB, 2.0), _h(DT, 2.5), _h(DT, 2.75),
+        _h(DD, 3.0), _h(DT, 3.25), _h(DT, 3.5), _h(DT, 3.75),
+    ],
+)
+
+# Dhol chaal — driving folk pattern
+Pattern._PRESETS["dhol chaal"] = dict(
+    name="dhol chaal",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(DB, 0.0), _h(DT, 0.25), _h(DD, 0.5),
+        _h(DT, 1.0), _h(DT, 1.25), _h(DT, 1.5), _h(DD, 1.75),
+        _h(DB, 2.0), _h(DT, 2.25), _h(DD, 2.5),
+        _h(DT, 3.0), _h(DT, 3.25), _h(DT, 3.5), _h(DT, 3.75),
+    ],
+)
+
+# ── Dholak patterns ─────────────────────────────────────────────────────
+DKG = DrumSound.DHOLAK_GE
+DKN = DrumSound.DHOLAK_NA
+DKT = DrumSound.DHOLAK_TIT
+
+# Qawwali — driving devotional pattern
+Pattern._PRESETS["qawwali"] = dict(
+    name="qawwali",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(DKG, 0.0), _h(DKN, 0.5), _h(DKT, 0.75),
+        _h(DKN, 1.0), _h(DKG, 1.5),
+        _h(DKG, 2.0), _h(DKN, 2.5), _h(DKT, 2.75),
+        _h(DKN, 3.0), _h(DKT, 3.25), _h(DKN, 3.5), _h(DKG, 3.75),
+    ],
+)
+
+# Dholak folk — light folk music pattern
+Pattern._PRESETS["dholak folk"] = dict(
+    name="dholak folk",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(DKG, 0.0), _h(DKN, 1.0), _h(DKT, 1.5),
+        _h(DKG, 2.0), _h(DKN, 3.0), _h(DKT, 3.5),
+    ],
+)
+
+# ── Mridangam patterns ──────────────────────────────────────────────────
+MTH = DrumSound.MRIDANGAM_THAM
+MN = DrumSound.MRIDANGAM_NAM
+MD = DrumSound.MRIDANGAM_DIN
+MTA = DrumSound.MRIDANGAM_THA
+
+# Adi talam — the fundamental Carnatic rhythm (8 beats: 4+2+2)
+Pattern._PRESETS["adi talam"] = dict(
+    name="adi talam",
+    time_signature="4/4",
+    beats=8.0,
+    hits=[
+        # Tha Din | Tha ka | Dhi na | Tha ka
+        _h(MD, 0.0), _h(MN, 1.0),
+        _h(MTH, 2.0), _h(MTA, 3.0),
+        _h(MD, 4.0), _h(MN, 5.0),
+        _h(MTH, 6.0), _h(MTA, 7.0),
+    ],
+)
+
+# Mridangam korvai — rhythmic cadence pattern
+Pattern._PRESETS["mridangam korvai"] = dict(
+    name="mridangam korvai",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(MD, 0.0), _h(MN, 0.25), _h(MTA, 0.5), _h(MN, 0.75),
+        _h(MTH, 1.0), _h(MN, 1.25), _h(MN, 1.5), _h(MTH, 1.75),
+        _h(MD, 2.0), _h(MTA, 2.25), _h(MN, 2.5), _h(MTA, 2.75),
+        _h(MD, 3.0), _h(MN, 3.5), _h(MD, 3.75),
+    ],
+)
+
+# ── Djembe patterns ─────────────────────────────────────────────────────
+JB = DrumSound.DJEMBE_BASS
+JT = DrumSound.DJEMBE_TONE
+JS = DrumSound.DJEMBE_SLAP
+
+# Djembe — standard West African pattern
+Pattern._PRESETS["djembe"] = dict(
+    name="djembe",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(JB, 0.0), _h(JT, 0.5), _h(JT, 0.75),
+        _h(JS, 1.0), _h(JT, 1.5),
+        _h(JB, 2.0), _h(JT, 2.5), _h(JT, 2.75),
+        _h(JS, 3.0), _h(JT, 3.25), _h(JS, 3.5),
+    ],
+)
+
+# Kuku — traditional Guinean harvest dance rhythm
+Pattern._PRESETS["kuku"] = dict(
+    name="kuku",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(JS, 0.0), _h(JS, 0.5),
+        _h(JT, 1.0), _h(JB, 1.5),
+        _h(JS, 2.0), _h(JS, 2.5),
+        _h(JT, 3.0), _h(JT, 3.25), _h(JB, 3.5),
+    ],
+)
+
+# Soli — powerful Mandinka rhythm
+Pattern._PRESETS["soli"] = dict(
+    name="soli",
+    time_signature="4/4",
+    beats=4.0,
+    hits=[
+        _h(JB, 0.0), _h(JT, 0.25), _h(JS, 0.5), _h(JT, 0.75),
+        _h(JB, 1.0), _h(JS, 1.5),
+        _h(JB, 2.0), _h(JT, 2.25), _h(JS, 2.5), _h(JT, 2.75),
+        _h(JB, 3.0), _h(JT, 3.5), _h(JS, 3.75),
+    ],
+)
+
 # ── Fill presets ──────────────────────────────────────────────────────────
 
 Pattern._FILLS["rock"] = dict(
@@ -1632,6 +1993,9 @@ class Part:
                  tremolo_rate: float = 5.0,
                  phaser: float = 0.0,
                  phaser_rate: float = 0.5,
+                 cabinet: float = 0.0,
+                 cabinet_brightness: float = 0.5,
+                 analog: float = 0.0,
                  fm_ratio: float = 2.0,
                  fm_index: float = 3.0):
         self.name = name
@@ -1675,8 +2039,13 @@ class Part:
         self.tremolo_rate = tremolo_rate
         self.phaser_mix = phaser
         self.phaser_rate = phaser_rate
+        self.cabinet = cabinet
+        self.cabinet_brightness = cabinet_brightness
+        self.analog = analog
         self.fm_ratio = fm_ratio
         self.fm_index = fm_index
+        self._system = "western"  # default, overridden by Score.part()
+        self._fretboard = None    # set by Score.part(fretboard=...)
         self.notes: list[Note] = []
         self._drum_hits: list[_Hit] = []
         self._drum_pattern_beats: float = 0.0
@@ -1692,7 +2061,7 @@ class Part:
         """
         if isinstance(tone_or_string, str):
             from .tones import Tone
-            tone_or_string = Tone.from_string(tone_or_string, system="western")
+            tone_or_string = Tone.from_string(tone_or_string, system=self._system)
         if isinstance(duration, (int, float)):
             duration = _RawDuration(duration)
         self.notes.append(Note(tone=tone_or_string, duration=duration, velocity=velocity))
@@ -1760,6 +2129,7 @@ class Part:
             "delay_mix": self.delay_mix, "delay_time": self.delay_time,
             "delay_feedback": self.delay_feedback,
             "phaser_mix": self.phaser_mix, "phaser_rate": self.phaser_rate,
+            "cabinet": self.cabinet, "cabinet_brightness": self.cabinet_brightness,
             "highpass": self.highpass, "highpass_q": self.highpass_q,
             "lowpass": self.lowpass, "lowpass_q": self.lowpass_q,
             "distortion_mix": self.distortion_mix,
@@ -1977,6 +2347,80 @@ class Part:
 
         return self
 
+    def strum(self, chord_name: str, duration=Duration.QUARTER, *,
+              direction: str = "down", velocity: int = 100,
+              strum_time: float = 0.08) -> "Part":
+        """Strum a chord using the part's fretboard fingering.
+
+        Looks up the chord on the fretboard, gets the fingering, and
+        adds each string as a rapid sequence with tiny time offsets —
+        like a real guitar strum. Muted strings are skipped.
+
+        Args:
+            chord_name: Chord name (e.g. ``"Am"``, ``"G"``, ``"D"``).
+            duration: Total duration of the strum (default QUARTER).
+            direction: ``"down"`` (low→high, default) or ``"up"`` (high→low).
+            velocity: Base velocity (each string gets slight variation).
+            strum_time: Time in beats for the full strum sweep
+                (default 0.03 = very fast). Larger values = slower,
+                more audible strum. Try 0.1 for a lazy strum.
+
+        Returns:
+            Self for chaining.
+
+        Example::
+
+            >>> guitar = score.part("guitar", instrument="acoustic_guitar",
+            ...                     fretboard=Fretboard.guitar())
+            >>> guitar.strum("Am", Duration.HALF)
+            >>> guitar.strum("G", Duration.HALF, direction="up")
+        """
+        if self._fretboard is None:
+            raise ValueError(
+                "Cannot strum without a fretboard. "
+                "Set fretboard= when creating the part."
+            )
+        from .charts import CHARTS
+
+        # Get the fingering
+        system_name = self._system if isinstance(self._system, str) else "western"
+        if system_name in CHARTS:
+            chart = CHARTS[system_name]
+        else:
+            chart = CHARTS["western"]
+        if chord_name in chart:
+            fingering = chart[chord_name].fingering(fretboard=self._fretboard)
+        else:
+            # Try fretboard.chord() as fallback
+            fingering = self._fretboard.chord(chord_name)
+
+        # Get the sounding tones (skips muted strings)
+        tones = fingering.tones  # list of Tone objects, high to low
+
+        if not tones:
+            self.rest(duration)
+            return self
+
+        # Order: down strum = low to high (reverse since tones are high-to-low)
+        if direction == "down":
+            strum_tones = list(reversed(tones))
+        else:
+            strum_tones = list(tones)
+
+        if hasattr(duration, 'value'):
+            total_beats = duration.value
+        else:
+            total_beats = float(duration)
+
+        # Build a Chord — all strings ring together through the
+        # shared body resonance, like a real guitar
+        from .chords import Chord as ChordClass
+        chord_obj = ChordClass(tones=strum_tones)
+
+        self.add(chord_obj, total_beats, velocity=velocity)
+
+        return self
+
     @property
     def is_drums(self) -> bool:
         """True if this part contains drum hits."""
@@ -2072,13 +2516,17 @@ class Score:
     """
 
     def __init__(self, time_signature="4/4", bpm=120, swing: float = 0.0,
-                 drum_humanize: float = 0.15):
+                 drum_humanize: float = 0.15, system: str = "western",
+                 temperament: str = "equal", reference_pitch: float = 440.0):
         if isinstance(time_signature, str):
             self.time_signature = TimeSignature.from_string(time_signature)
         else:
             self.time_signature = time_signature
         self.bpm = bpm
         self.swing = swing
+        self.system = system
+        self.temperament = temperament
+        self.reference_pitch = reference_pitch
         self._drum_humanize = drum_humanize
         self.notes: list[Note] = []
         self.parts: dict[str, Part] = {}
@@ -2175,8 +2623,12 @@ class Score:
              tremolo_rate: float = None,
              phaser: float = None,
              phaser_rate: float = None,
+             cabinet: float = None,
+             cabinet_brightness: float = None,
+             analog: float = None,
              fm_ratio: float = None,
-             fm_index: float = None) -> Part:
+             fm_index: float = None,
+             fretboard=None) -> Part:
         """Create a named part with its own synth voice and effects.
 
         Args:
@@ -2285,6 +2737,8 @@ class Score:
             "saturation": saturation,
             "tremolo_depth": tremolo_depth, "tremolo_rate": tremolo_rate,
             "phaser": phaser, "phaser_rate": phaser_rate,
+            "cabinet": cabinet, "cabinet_brightness": cabinet_brightness,
+            "analog": analog,
             "fm_ratio": fm_ratio, "fm_index": fm_index,
         }
         for k, v in _locals.items():
@@ -2294,6 +2748,8 @@ class Score:
         merged = {**_defaults, **explicit}
 
         p = Part(name, **merged)
+        p._system = self.system
+        p._fretboard = fretboard
         self.parts[name] = p
         return p
 

pytheory/systems.py

@@ -2,18 +2,53 @@ from ._statics import (
     TEMPERAMENTS, TONES, DEGREES, SCALES,
     INDIAN_SCALES, ARABIC_SCALES, JAPANESE_SCALES,
     BLUES_SCALES, GAMELAN_SCALES, SYSTEMS,
+    TONES_SHRUTI, DEGREES_SHRUTI, SHRUTI_SCALES,
+    TONES_ARABIC_24, DEGREES_ARABIC_24, ARABIC_24_SCALES,
+    TONES_SLENDRO, DEGREES_SLENDRO, SLENDRO_SCALES,
+    TONES_PELOG, DEGREES_PELOG, PELOG_SCALES,
+    TONES_THAI, DEGREES_THAI, THAI_SCALES,
+    TONES_TURKISH, DEGREES_TURKISH, TURKISH_SCALES,
+    TONES_CARNATIC, DEGREES_CARNATIC, CARNATIC_SCALES,
 )
 
 
 class System:
-    def __init__(self, *, tone_names, degrees, scales=None):
+    def __init__(self, *, tone_names, degrees, scales=None, c_index=None,
+                 period=2.0):
         self.tone_names = tone_names
 
         self.degrees = degrees
         self._scales = scales
 
+        # Period: the frequency ratio of one "octave" in this system.
+        # 2.0 for standard octave-based systems.
+        # 3.0 for Bohlen-Pierce (tritave).
+        self.period = period
+
+        # c_index: the index of the "reference C" in the tone list.
+        # For octave arithmetic — scientific pitch changes octave at C.
+        # Default 3 for 12-TET western (A=0, A#=1, B=2, C=3).
+        # For non-12-TET systems, this is the index of the tone nearest C,
+        # or 0 if no C equivalent exists.
+        if c_index is not None:
+            self.c_index = c_index
+        else:
+            # Try to find C in the tone names, fall back to 0
+            self.c_index = 0
+            for i, names in enumerate(tone_names):
+                if "C" in names:
+                    self.c_index = i
+                    break
+
         if scales is None:
-            self._scales = SCALES[self.semitones]
+            n = self.semitones
+            if n in SCALES:
+                self._scales = SCALES[n]
+            else:
+                # Generate chromatic scale for unknown sizes
+                self._scales = {
+                    "chromatic": (n, {}),
+                }
 
     @property
     def semitones(self):
@@ -25,13 +60,56 @@ class System:
         return tuple([Tone.from_tuple(tone) for tone in self.tone_names])
 
     def resolve_name(self, name: str) -> str | None:
-        """Resolve a note name (including flats) to the canonical name.
+        """Resolve a note name (including flats, double sharps/flats) to the canonical name.
+
+        Handles enharmonic equivalents:
+        - Standard names and their alternates (e.g. Bb, C#)
+        - Double sharps (C## = D, F## = G)
+        - Double flats (Dbb = C, Ebb = D)
 
         Returns the primary name if found, or None if not recognized.
         """
+        # Direct lookup first
         for names in self.tone_names:
             if name in names:
                 return names[0]
+
+        # Handle double sharps (e.g. C## → D, F## → G)
+        if name.endswith('##') and len(name) >= 3:
+            base = name[:-2]
+            base_idx = self._name_to_index(base)
+            if base_idx is not None:
+                resolved_idx = (base_idx + 2) % len(self.tone_names)
+                return self.tone_names[resolved_idx][0]
+
+        # Handle double flats (e.g. Dbb → C, Ebb → D)
+        if name.endswith('bb') and len(name) >= 3 and name[0] != 'b':
+            base = name[:-2]
+            base_idx = self._name_to_index(base)
+            if base_idx is not None:
+                resolved_idx = (base_idx - 2) % len(self.tone_names)
+                return self.tone_names[resolved_idx][0]
+
+        # Handle single sharps/flats on natural notes (e.g. Cb → B, E# → F)
+        if len(name) == 2:
+            base = name[0]
+            modifier = name[1]
+            base_idx = self._name_to_index(base)
+            if base_idx is not None:
+                if modifier == '#':
+                    resolved_idx = (base_idx + 1) % len(self.tone_names)
+                    return self.tone_names[resolved_idx][0]
+                elif modifier == 'b':
+                    resolved_idx = (base_idx - 1) % len(self.tone_names)
+                    return self.tone_names[resolved_idx][0]
+
+        return None
+
+    def _name_to_index(self, name: str) -> int | None:
+        """Return the index of a tone name, or None if not found."""
+        for i, names in enumerate(self.tone_names):
+            if name in names:
+                return i
         return None
 
 
@@ -139,11 +217,159 @@ class System:
     def __repr__(self):
         return f"<System semitones={self.semitones!r}>"
 
+
+def TET(n, *, names=None, reference_index=0, period=2.0):
+    """Create an N-tone equal temperament system.
+
+    Each step divides the period into *n* equal parts. The frequency
+    ratio between adjacent tones is ``period^(1/n)``.
+
+    For standard tunings the period is 2.0 (octave). For exotic systems
+    like Bohlen-Pierce, set ``period=3.0`` (tritave).
+
+    Args:
+        n: Number of equal divisions of the octave (e.g. 19, 24, 31, 53).
+        names: Optional list of *n* tone name strings. If omitted,
+            tones are numbered ``"0"`` through ``"n-1"``.
+        reference_index: Index of the tone that corresponds to A440
+            (default 0, meaning tone "0" = A4 = 440 Hz).
+
+    Returns:
+        A :class:`System` instance.
+
+    Example::
+
+        >>> edo19 = TET(19)
+        >>> from pytheory import Tone
+        >>> t = Tone("0", octave=4, system=edo19)
+        >>> t.frequency  # 440.0 Hz (tone 0 = A4)
+        440.0
+
+        >>> edo31 = TET(31)
+        >>> t = Tone("18", octave=4, system=edo31)
+        >>> t.frequency  # 18 steps above A in 31-TET
+    """
+    if names is not None:
+        if len(names) != n:
+            raise ValueError(f"Expected {n} names, got {len(names)}")
+        tone_names = [(name,) for name in names]
+    else:
+        tone_names = [(str(i),) for i in range(n)]
+
+    # Degrees: numbered, with no modal names
+    degrees = [(f"degree {i+1}", ()) for i in range(n)]
+
+    # Scales: chromatic (all steps = 1) plus MOS scales for common EDOs
+    scale_data = {
+        "chromatic": (n, {}),
+    }
+
+    # Add well-known scales for specific EDOs
+    if n == 19:
+        # 19-TET: major and minor have different step sizes
+        # Major: 3 3 2 3 3 3 2 (sums to 19)
+        # Minor: 3 2 3 3 2 3 3
+        scale_data["heptatonic"] = [7, {
+            "major": {"intervals": (3, 3, 2, 3, 3, 3, 2)},
+            "minor": {"intervals": (3, 2, 3, 3, 2, 3, 3)},
+            "harmonic minor": {"intervals": (3, 2, 3, 3, 2, 4, 2)},
+        }]
+        scale_data["pentatonic"] = [5, {
+            "major pentatonic": {"intervals": (3, 3, 5, 3, 5)},
+            "minor pentatonic": {"intervals": (5, 3, 3, 5, 3)},
+        }]
+    elif n == 24:
+        # 24-TET (quarter-tone): standard 12-TET scales with doubled steps
+        scale_data["heptatonic"] = [7, {
+            "major": {"intervals": (4, 4, 2, 4, 4, 4, 2)},
+            "minor": {"intervals": (4, 2, 4, 4, 2, 4, 4)},
+        }]
+    elif n == 31:
+        # 31-TET: excellent approximation of quarter-comma meantone
+        # Major: 5 5 3 5 5 5 3 (sums to 31)
+        # Minor: 5 3 5 5 3 5 5
+        scale_data["heptatonic"] = [7, {
+            "major": {"intervals": (5, 5, 3, 5, 5, 5, 3)},
+            "minor": {"intervals": (5, 3, 5, 5, 3, 5, 5)},
+            "harmonic minor": {"intervals": (5, 3, 5, 5, 3, 7, 3)},
+        }]
+        scale_data["pentatonic"] = [5, {
+            "major pentatonic": {"intervals": (5, 5, 8, 5, 8)},
+            "minor pentatonic": {"intervals": (8, 5, 5, 8, 5)},
+        }]
+    elif n == 53:
+        # 53-TET: nearly perfect fifths and thirds
+        # Major: 9 9 4 9 9 9 4 (sums to 53)
+        scale_data["heptatonic"] = [7, {
+            "major": {"intervals": (9, 9, 4, 9, 9, 9, 4)},
+            "minor": {"intervals": (9, 4, 9, 9, 4, 9, 9)},
+        }]
+
+    # Find C equivalent for c_index (reference_index is A, C is 3 steps in 12-TET)
+    # Proportionally: C is 3/12 of the way around from A
+    c_idx = round(n * 3 / 12) if n != 12 else 3
+
+    return System(
+        tone_names=tone_names,
+        degrees=degrees,
+        scales=scale_data,
+        c_index=c_idx,
+        period=period,
+    )
+
+
+# ── 19-TET named system ──
+# Traditional note names for 19-TET: all 12 western notes plus
+# 7 quarter-tone positions (enharmonic splits)
+_19TET_NAMES = [
+    "A", "A#", "Bb", "B", "B#",
+    "C", "C#", "Db", "D", "D#",
+    "Eb", "E", "E#", "F", "F#",
+    "Gb", "G", "G#", "Ab",
+]
+
+# ── 31-TET named system ──
+# Adriaan Fokker's naming: sharps and flats are distinct pitches
+_31TET_NAMES = [
+    "A", "A↑", "A#", "Bb", "B↓",
+    "B", "B↑", "C", "C↑", "C#",
+    "Db", "D↓", "D", "D↑", "D#",
+    "Eb", "E↓", "E", "E↑", "E#",
+    "F", "F↑", "F#", "Gb", "G↓",
+    "G", "G↑", "G#", "Ab", "A↓",
+    "A♮",  # enharmonic return (distinct from "A" by a diesis)
+]
+
+
 SYSTEMS = {
     "western": System(tone_names=TONES["western"], degrees=DEGREES["western"]),
-    "indian": System(tone_names=TONES["indian"], degrees=DEGREES["indian"], scales=INDIAN_SCALES[12]),
-    "arabic": System(tone_names=TONES["arabic"], degrees=DEGREES["arabic"], scales=ARABIC_SCALES[12]),
+    "indian": System(tone_names=TONES["indian"], degrees=DEGREES["indian"], scales=INDIAN_SCALES[12], c_index=3),
+    "arabic": System(tone_names=TONES["arabic"], degrees=DEGREES["arabic"], scales=ARABIC_SCALES[12], c_index=3),
     "japanese": System(tone_names=TONES["japanese"], degrees=DEGREES["japanese"], scales=JAPANESE_SCALES[12]),
     "blues": System(tone_names=TONES["blues"], degrees=DEGREES["blues"], scales=BLUES_SCALES[12]),
-    "gamelan": System(tone_names=TONES["gamelan"], degrees=DEGREES["gamelan"], scales=GAMELAN_SCALES[12]),
+    "gamelan": System(tone_names=TONES["gamelan"], degrees=DEGREES["gamelan"], scales=GAMELAN_SCALES[12], c_index=3),
+    "19-tet": TET(19, names=_19TET_NAMES),
+    "31-tet": TET(31, names=_31TET_NAMES),
+    # Microtonal systems with proper intervals (not 12-TET approximations)
+    "shruti": System(tone_names=TONES_SHRUTI, degrees=DEGREES_SHRUTI,
+                     scales=SHRUTI_SCALES, c_index=5),
+    "maqam": System(tone_names=TONES_ARABIC_24, degrees=DEGREES_ARABIC_24,
+                    scales=ARABIC_24_SCALES, c_index=5),
+    "slendro": System(tone_names=TONES_SLENDRO, degrees=DEGREES_SLENDRO,
+                      scales=SLENDRO_SCALES, c_index=1),
+    "pelog": System(tone_names=TONES_PELOG, degrees=DEGREES_PELOG,
+                    scales=PELOG_SCALES, c_index=2),
+    "thai": System(tone_names=TONES_THAI, degrees=DEGREES_THAI,
+                   scales=THAI_SCALES, c_index=0),
+    "makam": System(tone_names=TONES_TURKISH, degrees=DEGREES_TURKISH,
+                    scales=TURKISH_SCALES, c_index=13),
+    "carnatic": System(tone_names=TONES_CARNATIC, degrees=DEGREES_CARNATIC,
+                       scales=CARNATIC_SCALES, c_index=18),  # Sa ≈ C, 18 steps from A
+    # Bohlen-Pierce: 13 equal divisions of the tritave (3:1).
+    # Genuinely alien — no octaves, no fifths, built on 3:5:7 harmonics.
+    # Used by composers like Heinz Bohlen, Kees van Prooijen, Georg Hajdu.
+    "bohlen-pierce": TET(13, period=3.0, names=[
+        "A", "B", "C", "D", "E", "F", "G",
+        "H", "J", "K", "L", "M", "N",
+    ]),
 }

pytheory/tones.py

@@ -47,15 +47,28 @@ class Tone:
             alt_names = []
 
         if isinstance(name, str):
-            try:
-                parsed_octave = int("".join([c for c in filter(str.isdigit, name)]))
-            except ValueError:
-                parsed_octave = None
+            # Normalize unicode music symbols to ASCII equivalents
+            name = (name
+                    .replace('\u266f', '#')   # ♯ → #
+                    .replace('\u266d', 'b')   # ♭ → b
+                    .replace('\U0001d12a', '##')  # 𝄪 → ##
+                    .replace('\U0001d12b', 'bb')  # 𝄫 → bb
+                    )
+            # Normalize 'x' / 'X' as double sharp (only after letter name)
+            if len(name) >= 2 and name[1] in ('x', 'X') and name[0].isalpha():
+                name = name[0] + '##' + name[2:]
 
-            if parsed_octave is not None:
-                name = name.replace(str(parsed_octave), "")
-                if octave is None:
-                    octave = parsed_octave
+            # Only parse trailing digits as octave (e.g. "C4" → "C", octave=4).
+            # Digits embedded in the name (e.g. "Mib+1") are NOT octaves.
+            # Numeric pitch class names ("0", "11") are also left alone.
+            if name and name[0].isalpha():
+                import re as _re
+                m = _re.search(r'(\d+)$', name)
+                if m:
+                    parsed_octave = int(m.group(1))
+                    name = name[:m.start()]
+                    if octave is None:
+                        octave = parsed_octave
 
         self.name = name
         self.octave = octave
@@ -343,12 +356,15 @@ class Tone:
         Returns:
             A new ``Tone`` instance.
         """
-        try:
-            octave = int("".join([c for c in filter(str.isdigit, s)]))
-        except ValueError:
-            octave = None
-
-        tone = s.replace(str(octave), "") if octave else s
+        import re as _re
+        octave = None
+        tone = s
+        # Only parse trailing digits as octave
+        if s and s[0].isalpha():
+            m = _re.search(r'(\d+)$', s)
+            if m:
+                octave = int(m.group(1))
+                tone = s[:m.start()]
 
         if system:
             return klass(name=tone, octave=octave, system=system)
@@ -389,19 +405,20 @@ class Tone:
         import math
         if hz <= 0:
             raise ValueError("Frequency must be positive")
-        # Semitones from A4
-        semitones_from_a4 = 12 * math.log2(hz / REFERENCE_A)
-        semitones = round(semitones_from_a4)
-        # A4 is index 0 in the Western system, octave 4
-        # Convert to absolute position from C0
-        a4_from_c0 = ((0 - C_INDEX) % 12) + (4 * 12)  # = 57
-        abs_pos = a4_from_c0 + semitones
-        octave = abs_pos // 12
-        relative = abs_pos % 12
-        index = (relative + C_INDEX) % 12
         if isinstance(system, str):
             from .systems import SYSTEMS
             system = SYSTEMS[system]
+        n = len(system.tone_names)
+        c_idx = getattr(system, 'c_index', C_INDEX)
+        # Steps from A4 in this EDO
+        steps_from_a4 = n * math.log2(hz / REFERENCE_A)
+        steps = round(steps_from_a4)
+        # A4 is index 0, octave 4. Convert to absolute position from C0.
+        a4_from_c0 = ((0 - c_idx) % n) + (4 * n)
+        abs_pos = a4_from_c0 + steps
+        octave = abs_pos // n
+        relative = abs_pos % n
+        index = (relative + c_idx) % n
         return klass.from_index(index, octave=octave, system=system)
 
     @classmethod
@@ -417,13 +434,19 @@ class Tone:
             >>> Tone.from_midi(69)
             <Tone A4>
         """
+        if isinstance(system, str):
+            from .systems import SYSTEMS
+            system = SYSTEMS[system]
+        # MIDI is a 12-TET standard. Convert to Hz and use from_frequency
+        # for non-12 systems.
+        n = len(system.tone_names)
+        if n != 12:
+            hz = REFERENCE_A * (2 ** ((note_number - 69) / 12))
+            return klass.from_frequency(hz, system=system)
         adjusted = note_number - 12  # MIDI C0=12
         octave = adjusted // 12
         relative = adjusted % 12
         index = (relative + C_INDEX) % 12
-        if isinstance(system, str):
-            from .systems import SYSTEMS
-            system = SYSTEMS[system]
         return klass.from_index(index, octave=octave, system=system)
 
     @classmethod
@@ -442,10 +465,27 @@ class Tone:
         """
         tone_names = system.tone_names[i]
         if prefer_flats and len(tone_names) > 1:
-            tone = tone_names[1]  # flat spelling (e.g. "Bb")
+            # Find the first flat spelling (contains 'b' but isn't just 'B')
+            tone = tone_names[0]  # fallback to primary
+            for tn in tone_names[1:]:
+                if 'b' in tn and tn != 'B':
+                    tone = tn
+                    break
         else:
-            tone = tone_names[0]  # sharp spelling (e.g. "A#")
-        return klass(name=tone, octave=octave, system=system)
+            tone = tone_names[0]  # primary spelling
+        # Bypass parsing and validation — name comes from a known system index
+        obj = klass.__new__(klass)
+        obj.name = tone
+        obj.octave = octave
+        obj.alt_names = list(tone_names[1:]) if len(tone_names) > 1 else []
+        obj._frequency = None
+        if isinstance(system, str):
+            obj.system_name = system
+            obj._system = None
+        else:
+            obj.system_name = None
+            obj._system = system
+        return obj
 
     @property
     def _index(self) -> int:
@@ -461,7 +501,15 @@ class Tone:
             canonical = self.system.resolve_name(self.name)
             if canonical is None:
                 raise ValueError(f"Tone {self.name!r} not found in system")
-            return self.system.tones.index(canonical)
+            # Use _name_to_index for direct lookup (avoids creating Tone objects)
+            idx = self.system._name_to_index(canonical)
+            if idx is not None:
+                return idx
+            # Fallback: linear search through tone_names
+            for i, names in enumerate(self.system.tone_names):
+                if canonical in names:
+                    return i
+            raise ValueError(f"Tone {self.name!r} not found in system")
         except AttributeError:
             raise ValueError("Tone index cannot be referenced without a system!")
 
@@ -475,19 +523,21 @@ class Tone:
         octave = self.octave or 0
 
         try:
-            mod = len(self.system.tones)
+            mod = len(self.system.tone_names)
         except AttributeError:
             raise ValueError(
                 "Tone math can only be computed with an associated system!"
             )
 
-        # Convert to absolute semitones from C0
-        note_from_c0 = ((self._index - C_INDEX) % mod) + (octave * mod)
+        c_idx = getattr(self.system, 'c_index', C_INDEX)
+
+        # Convert to absolute steps from C0
+        note_from_c0 = ((self._index - c_idx) % mod) + (octave * mod)
         note_from_c0 += interval
 
         new_octave = note_from_c0 // mod
         relative = note_from_c0 % mod
-        new_index = (relative + C_INDEX) % mod
+        new_index = (relative + c_idx) % mod
 
         return (new_index, new_octave)
 
@@ -538,9 +588,10 @@ class Tone:
             'octave'
         """
         semitones = abs(self - other)
-        octaves = semitones // 12
-        remainder = semitones % 12
-        name = self._INTERVAL_NAMES.get(remainder, f"{remainder} semitones")
+        n = len(self.system.tones)
+        octaves = semitones // n
+        remainder = semitones % n
+        name = self._INTERVAL_NAMES.get(remainder, f"{remainder} steps")
         if octaves == 0:
             return name
         if remainder == 0:
@@ -563,6 +614,12 @@ class Tone:
         """
         if self.octave is None:
             return None
+        n = len(self.system.tones)
+        if n != 12:
+            # Non-12-TET: approximate MIDI via frequency
+            import math
+            hz = self.pitch()
+            return round(69 + 12 * math.log2(hz / REFERENCE_A))
         semitones_from_c0 = ((self._index - C_INDEX) % 12) + (self.octave * 12)
         return semitones_from_c0 + 12  # MIDI C0 = 12 (C-1 = 0)
 
@@ -604,42 +661,43 @@ class Tone:
         return 1200 * math.log2(f2 / f1)
 
     def circle_of_fifths(self) -> list[Tone]:
-        """The 12 tones of the circle of fifths starting from this tone.
+        """The circle of fifths starting from this tone.
 
-        Each step ascends by a perfect fifth (7 semitones). After 12
-        steps you return to the starting tone. The circle of fifths
-        is the backbone of Western harmony — it determines key
-        signatures, chord relationships, and modulation paths.
-
-        Clockwise = add sharps: C → G → D → A → E → B → F# → ...
-        Counter-clockwise = add flats (see ``circle_of_fourths``).
+        Each step ascends by a perfect fifth (7 semitones in 12-TET).
+        After N steps (where N = number of tones in the system) you
+        return to the starting tone. The circle of fifths is the
+        backbone of Western harmony — it determines key signatures,
+        chord relationships, and modulation paths.
 
         Returns:
-            A list of 12 Tones.
+            A list of Tones (12 for Western, N for other systems).
         """
+        n = len(self.system.tones)
+        # Perfect fifth: the closest approximation to 3:2 ratio
+        fifth = round(n * 7 / 12)  # 7 in 12-TET, 11 in 19-TET, 18 in 31-TET
         tones: list[Tone] = []
         t = self
-        for _ in range(12):
+        for _ in range(n):
             tones.append(t)
-            t = t.add(7)
+            t = t.add(fifth)
         return tones
 
     def circle_of_fourths(self) -> list[Tone]:
-        """The 12 tones of the circle of fourths starting from this tone.
+        """The circle of fourths starting from this tone.
 
-        Each step ascends by a perfect fourth (5 semitones) — the
-        reverse direction of the circle of fifths.
-
-        Clockwise = add flats: C → F → Bb → Eb → Ab → ...
+        Each step ascends by a perfect fourth — the reverse direction
+        of the circle of fifths.
 
         Returns:
-            A list of 12 Tones.
+            A list of Tones (12 for Western, N for other systems).
         """
+        n = len(self.system.tones)
+        fourth = round(n * 5 / 12)  # 5 in 12-TET, 8 in 19-TET, 13 in 31-TET
         tones: list[Tone] = []
         t = self
-        for _ in range(12):
+        for _ in range(n):
             tones.append(t)
-            t = t.add(5)
+            t = t.add(fourth)
         return tones
 
     @property
@@ -695,21 +753,32 @@ class Tone:
         precision: Optional[int] = None,
     ) -> float:
         try:
-            tones = len(self.system.tones)
+            tones = len(self.system.tone_names)
         except AttributeError:
             raise ValueError("Pitches can only be computed with an associated system!")
 
-        pitch_scale = TEMPERAMENTS[temperament](tones)
+        # Period ratio: 2.0 for standard octave-based systems,
+        # 3.0 for Bohlen-Pierce (tritave), configurable per system.
+        period = getattr(self.system, 'period', 2.0)
+        c_idx = getattr(self.system, 'c_index', C_INDEX)
+
+        if period != 2.0 and temperament == "equal":
+            # Non-octave period (e.g. Bohlen-Pierce tritave=3.0):
+            # generate ratios as period^(n/tones) instead of 2^(n/tones)
+            import sympy
+            pitch_scale = [period ** sympy.Rational(i, tones) for i in range(tones + 1)]
+        else:
+            pitch_scale = TEMPERAMENTS[temperament](tones)
         octave = self.octave if self.octave is not None else 4
 
-        note_from_c0 = ((self._index - C_INDEX) % tones) + (octave * tones)
-        a4_from_c0 = ((0 - C_INDEX) % tones) + (4 * tones)  # A4
+        note_from_c0 = ((self._index - c_idx) % tones) + (octave * tones)
+        a4_from_c0 = ((0 - c_idx) % tones) + (4 * tones)  # A4
 
         diff = note_from_c0 - a4_from_c0
         octave_shift = diff // tones
         within_octave = diff % tones
 
-        ratio = pitch_scale[within_octave] * (2 ** octave_shift)
+        ratio = pitch_scale[within_octave] * (period ** octave_shift)
 
         if symbolic:
             return reference_pitch * ratio

test_pytheory.py

@@ -5320,7 +5320,7 @@ def test_supersaw_wave():
 @needs_portaudio
 def test_all_synths_in_enum():
     from pytheory.play import Synth
-    assert len(Synth) == 13
+    assert len(Synth) == 27
     for s in Synth:
         wave = s(440, n_samples=1000)
         assert len(wave) == 1000
@@ -6467,11 +6467,8 @@ def test_instrument_piano():
     from pytheory import Score, Duration
     score = Score("4/4", bpm=120)
     p = score.part("p", instrument="piano")
-    assert p.synth == "fm"
-    assert p.envelope == "piano"
-    assert p.detune == 5
-    assert p.lowpass == 6000
-    assert p.chorus_mix == 0.1
+    assert p.synth == "piano_synth"
+    assert p.vel_to_filter == 3000
 
 
 def test_instrument_violin():
@@ -6488,12 +6485,9 @@ def test_instrument_violin():
 def test_instrument_override():
     from pytheory import Score
     score = Score("4/4", bpm=120)
-    # Explicit synth overrides the preset's "fm"
+    # Explicit synth overrides the preset
     p = score.part("p", instrument="piano", synth="saw")
     assert p.synth == "saw"
-    # Other preset values still apply
-    assert p.envelope == "piano"
-    assert p.detune == 5
 
 
 def test_instrument_unknown_raises():
@@ -6534,3 +6528,186 @@ def test_instrument_808_bass():
     assert p.lowpass_q == 1.5
     assert p.synth == "sine"
     assert p.envelope == "pluck"
+
+
+# ── Non-12-TET / Microtonal systems ─────────────────────────────────────────
+
+from pytheory import TET
+
+
+def test_tet_factory_creates_system():
+    edo17 = TET(17)
+    assert len(edo17.tone_names) == 17
+    assert edo17.semitones == 17
+
+
+def test_tet_factory_numbered_tones():
+    edo17 = TET(17)
+    t = Tone("0", octave=4, system=edo17)
+    assert t.frequency == pytest.approx(440.0, rel=1e-3)
+    # One octave up
+    t_up = t.add(17)
+    assert t_up.frequency == pytest.approx(880.0, rel=1e-3)
+
+
+def test_tet_factory_custom_names():
+    names = ["A", "B", "C", "D", "E"]
+    edo5 = TET(5, names=names)
+    assert len(edo5.tone_names) == 5
+    t = Tone("A", octave=4, system=edo5)
+    assert t.frequency == pytest.approx(440.0, rel=1e-3)
+
+
+def test_tet_factory_wrong_name_count():
+    with pytest.raises(ValueError):
+        TET(5, names=["A", "B", "C"])
+
+
+def test_19tet_system():
+    sys19 = SYSTEMS["19-tet"]
+    assert sys19.semitones == 19
+    a = Tone("A", octave=4, system=sys19)
+    assert a.frequency == pytest.approx(440.0, rel=1e-3)
+    # Octave should double
+    a5 = a.add(19)
+    assert a5.frequency == pytest.approx(880.0, rel=1e-3)
+
+
+def test_19tet_scale():
+    sys19 = SYSTEMS["19-tet"]
+    ts = TonedScale(system=sys19, tonic=Tone("C", octave=4, system=sys19))
+    major = ts["major"]
+    assert len(major.tones) == 8  # 7 + octave
+
+
+def test_31tet_system():
+    sys31 = SYSTEMS["31-tet"]
+    assert sys31.semitones == 31
+    a = Tone("A", octave=4, system=sys31)
+    assert a.frequency == pytest.approx(440.0, rel=1e-3)
+
+
+def test_shruti_system():
+    shruti = SYSTEMS["shruti"]
+    assert shruti.semitones == 22
+    sa = Tone("Sa", octave=4, system=shruti)
+    # Sa should be near C4 (261.63 Hz) — not exact due to 22-TET
+    assert 250 < sa.frequency < 270
+
+
+def test_shruti_octave():
+    shruti = SYSTEMS["shruti"]
+    sa4 = Tone("Sa", octave=4, system=shruti)
+    sa5 = sa4.add(22)
+    assert sa5.frequency == pytest.approx(sa4.frequency * 2, rel=1e-3)
+
+
+def test_shruti_bhairav_scale():
+    shruti = SYSTEMS["shruti"]
+    ts = TonedScale(system=shruti, tonic=Tone("Sa", octave=4, system=shruti))
+    bhairav = ts["bhairav"]
+    names = [t.name for t in bhairav.tones]
+    assert names[0] == "Sa"
+    assert "komal Re" in names  # the microtonal komal Re
+    assert len(bhairav.tones) == 8
+
+
+def test_maqam_system():
+    maqam = SYSTEMS["maqam"]
+    assert maqam.semitones == 24
+    do = Tone("Do", octave=4, system=maqam)
+    assert 250 < do.frequency < 270
+
+
+def test_maqam_rast_has_quarter_tones():
+    maqam = SYSTEMS["maqam"]
+    ts = TonedScale(system=maqam, tonic=Tone("Do", octave=4, system=maqam))
+    rast = ts["rast"]
+    names = [t.name for t in rast.tones]
+    # Rast should contain quarter-tone positions
+    assert any("↓" in n or "↑" in n for n in names)
+
+
+def test_slendro_system():
+    slendro = SYSTEMS["slendro"]
+    assert slendro.semitones == 5
+    ji = Tone("ji", octave=4, system=slendro)
+    # 5 steps = octave
+    ji_up = ji.add(5)
+    assert ji_up.frequency == pytest.approx(ji.frequency * 2, rel=1e-3)
+
+
+def test_pelog_system():
+    pelog = SYSTEMS["pelog"]
+    assert pelog.semitones == 9
+    ts = TonedScale(system=pelog, tonic=Tone("ji", octave=4, system=pelog))
+    full_pelog = ts["pelog"]
+    assert len(full_pelog.tones) == 8
+
+
+def test_thai_system():
+    thai = SYSTEMS["thai"]
+    assert thai.semitones == 7
+    do = Tone("do", octave=4, system=thai)
+    # 7 steps = octave
+    do_up = do.add(7)
+    assert do_up.frequency == pytest.approx(do.frequency * 2, rel=1e-3)
+
+
+def test_turkish_makam_system():
+    makam = SYSTEMS["makam"]
+    assert makam.semitones == 53
+    ts = TonedScale(system=makam, tonic=Tone("Do", octave=4, system=makam))
+    rast = ts["rast"]
+    assert len(rast.tones) == 8
+
+
+def test_carnatic_system():
+    carnatic = SYSTEMS["carnatic"]
+    assert carnatic.semitones == 72
+    ts = TonedScale(system=carnatic, tonic=Tone("Sa", octave=4, system=carnatic))
+    shankarabharanam = ts["shankarabharanam"]
+    assert len(shankarabharanam.tones) == 8
+
+
+def test_circle_of_fifths_19tet():
+    sys19 = SYSTEMS["19-tet"]
+    c = Tone("C", octave=4, system=sys19)
+    cof = c.circle_of_fifths()
+    assert len(cof) == 19  # should cycle through all 19 tones
+
+
+def test_circle_of_fifths_western_unchanged():
+    """Existing 12-TET circle of fifths should not be affected."""
+    c = Tone("C", octave=4, system="western")
+    cof = c.circle_of_fifths()
+    assert len(cof) == 12
+    assert cof[0].name == "C"
+    assert cof[1].name == "G"
+
+
+def test_from_frequency_non12():
+    sys19 = SYSTEMS["19-tet"]
+    t = Tone.from_frequency(440.0, system=sys19)
+    assert t.name == "A"
+    assert t.octave == 4
+
+
+def test_score_system_param():
+    """Score passes system to parts for string→Tone resolution."""
+    from pytheory import Score, Duration
+    shruti = SYSTEMS["shruti"]
+    score = Score("4/4", bpm=120, system=shruti)
+    p = score.part("test", synth="sine")
+    assert p._system is shruti
+    # String "Sa" should resolve via shruti system, not western
+    p.add(Tone("Sa", octave=4, system=shruti), Duration.QUARTER)
+    assert len(p.notes) == 1
+
+
+def test_interval_to_non12():
+    sys19 = SYSTEMS["19-tet"]
+    a = Tone("A", octave=4, system=sys19)
+    a5 = a.add(19)
+    result = a.interval_to(a5)
+    assert "octave" in result

uv.lock

@@ -707,7 +707,7 @@ wheels = [
 
 [[package]]
 name = "pytheory"
-version = "0.32.0"
+version = "0.34.0"
 source = { editable = "." }
 dependencies = [
     { name = "numeral" },