Fix acid example, add basic chords audio, regenerate all 34 samples

All audio files: stereo, normalized, no issues.

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

docs/generate_audio.py

@@ -409,8 +409,8 @@ def gen_legato_glide():
     score.set_drum_effects(volume=0.35)
     acid = score.part("acid", synth="saw", volume=0.6,
                       legato=True, glide=0.04,
-                      lowpass=1500, lowpass_q=8.0,
-                      distortion=0.4, distortion_drive=4.0)
+                      lowpass=3000, lowpass_q=6.0,
+                      distortion=0.3, distortion_drive=3.0)
     acid.lfo("lowpass", rate=0.5, min=800, max=4000, bars=4)
     for _ in range(4):
         acid.add("C2", 0.25).add("C3", 0.25).add("G2", 0.25).add("C2", 0.25)
@@ -443,6 +443,15 @@ def gen_quickstart():
 
 # ── Sequencing complete example (bossa nova) ─────────────────────────────
 
+def gen_chords_basic():
+    score = Score("4/4", bpm=120)
+    key = Key("C", "major")
+    chords = key.progression("I", "V", "vi", "IV")
+    for chord in chords:
+        score.add(chord, Duration.WHOLE)
+    render("chords_basic", score)
+
+
 def gen_complete_rock():
     score = Score("4/4", bpm=120)
     score.drums("rock", repeats=8, fill="rock", fill_every=4)
@@ -547,6 +556,7 @@ GENERATORS = [
     gen_dub_reggae,
     gen_jazz_ballad,
     gen_quickstart,
+    gen_chords_basic,
     gen_complete_rock,
     gen_salsa_layered,
     gen_playback_basic,

docs/guide/sequencing.rst

@@ -161,6 +161,10 @@ Chords work just like tones — pass any ``Chord`` object:
    for chord in chords:
        score.add(chord, Duration.WHOLE)
 
+.. raw:: html
+
+   <audio controls style="width:100%;margin:0.5em 0 1.5em"><source src="../_static/audio/chords_basic.wav" type="audio/wav"></audio>
+
 .. code-block:: pycon
 
    >>> score.measures
@@ -353,9 +357,9 @@ portamento (pitch slides between notes):
        synth="saw",
        legato=True,
        glide=0.04,
-       lowpass=1500,
-       lowpass_q=8.0,
-       distortion=0.4,
+       lowpass=3000,
+       lowpass_q=6.0,
+       distortion=0.3,
    )
    acid.add("C2", 0.25).add("C3", 0.25).add("G2", 0.25).add("C2", 0.25)