diff --git a/tracks/an_exception_occurred.py b/tracks/an_exception_occurred.py
index b5cebe6..b801d46 100644
--- a/tracks/an_exception_occurred.py
+++ b/tracks/an_exception_occurred.py
@@ -519,6 +519,26 @@ theremin.add(Eb.add(-12), Duration.WHOLE, velocity=20, bend=-0.25)
 for _ in range(30):
     theremin.rest(Duration.WHOLE)
 
+# ── RING — sparse ring mod hits, spectral accents ──────────────
+ring = score.part("ring", synth="ring_mod", envelope="pluck", volume=0.12,
+                  reverb=0.2, reverb_type="cathedral",
+                  delay=0.1, delay_time=0.375, delay_feedback=0.15,
+                  pan=0.35)
+
+# Bars 1-24: silence
+for _ in range(24):
+    ring.rest(Duration.WHOLE)
+
+# Bars 25-32: sparse hits — every other bar
+for _ in range(4):
+    ring.add(Eb.add(12), Duration.QUARTER, velocity=55)
+    ring.rest(Duration.DOTTED_HALF)
+    ring.rest(Duration.WHOLE)
+
+# Bars 33-68: silence — let it dissolve (remaining bars)
+for _ in range(32):
+    ring.rest(Duration.WHOLE)
+
 # ── ORGAN — the hospital, the hymn, bars 33-40 ─────────────────
 # Christian hymn on a pipe organ. Institutional. But grounding.
 # "Be still and know."
diff --git a/tracks/deep_time.py b/tracks/deep_time.py
index 576387e..1c66f6a 100644
--- a/tracks/deep_time.py
+++ b/tracks/deep_time.py
@@ -211,7 +211,7 @@ for i in range(6):
         bowl.rest(Duration.WHOLE)
 
 # ── HIGH TEXTURE — triangle shimmer, almost subliminal ─────────
-shimmer = score.part("shimmer", synth="triangle", envelope="pad", volume=0.06,
+shimmer = score.part("shimmer", synth="drift", envelope="pad", volume=0.06,
                      reverb=0.9, reverb_type="taj_mahal",
                      chorus=0.6, chorus_rate=0.05, chorus_depth=0.03,
                      lowpass=2000, pan=-0.4)
@@ -280,6 +280,23 @@ wind.lfo("volume", rate=0.015, min=0.01, max=0.05, bars=48, shape="triangle")
 for _ in range(48):
     wind.add(B, Duration.WHOLE, velocity=30)
 
+# ── GRAIN — deep granular texture, barely perceptible ──────────
+grain = score.part("grain", instrument="granular_pad", volume=0.06,
+                   reverb=0.5, reverb_type="taj_mahal",
+                   pan=0.35)
+
+# Bars 1-16: silence
+for _ in range(16):
+    grain.rest(Duration.WHOLE)
+
+# Bars 17-40: low B drone, glacial
+for _ in range(24):
+    grain.add(B.add(-12), Duration.WHOLE, velocity=30)
+
+# Bars 41-48: silence — dissolve
+for _ in range(8):
+    grain.rest(Duration.WHOLE)
+
 # ── THEREMIN — emotional break, center of the piece ─────────────
 theremin = score.part("theremin", instrument="theremin", volume=0.22,
                       reverb=0.5, reverb_type="taj_mahal",
diff --git a/tracks/ghost_protocol.py b/tracks/ghost_protocol.py
index b8560a1..c862b1c 100644
--- a/tracks/ghost_protocol.py
+++ b/tracks/ghost_protocol.py
@@ -103,7 +103,7 @@ for _ in range(96):
     trip.rest(Duration.WHOLE)
 
 # ── THE ARP — the soul of the track, enters quietly bar 17 ─────
-arp = score.part("arp", synth="saw", envelope="pluck", volume=0.22,
+arp = score.part("arp", synth="drift", envelope="pluck", volume=0.22,
                  reverb=0.35, delay=0.4, delay_time=0.234,
                  delay_feedback=0.45, lowpass=1200, detune=6,
                  pan=0.15, humanize=0.04)
diff --git a/tracks/intrusive.py b/tracks/intrusive.py
index 19312c2..46e8a32 100644
--- a/tracks/intrusive.py
+++ b/tracks/intrusive.py
@@ -43,7 +43,7 @@ def play_thought(part, vel_offset=0, rest_after=Duration.WHOLE):
 
 
 # ── THE THOUGHT — piano, the thing you can't unthink ──────────
-thought = score.part("thought", synth="saw", volume=0.4,
+thought = score.part("thought", synth="wavefold", envelope="organ", volume=0.4,
                      lowpass=3000, distortion=0.1, distortion_drive=1.5,
                      saturation=0.4, legato=True, glide=0.03,
                      reverb=0.25, reverb_type="spring",
diff --git a/tracks/the_interruption.py b/tracks/the_interruption.py
index 96ea68a..46665ba 100644
--- a/tracks/the_interruption.py
+++ b/tracks/the_interruption.py
@@ -460,7 +460,7 @@ for vel in [85, 78, 70, 62, 55, 48, 40, 35, 30, 25, 22, 20, 18, 15, 12, 8]:
     sub.add(D.add(-24), Duration.WHOLE, velocity=vel)
 
 # ── REESE BASS — detuned saw, DnB signature ────────────────────
-reese = score.part("reese", synth="saw", envelope="pad", volume=0.28,
+reese = score.part("reese", synth="drift", envelope="pad", volume=0.28,
                    lowpass=400, detune=15, spread=0.3,
                    distortion=0.2, sidechain=0.35,
                    reverb=0.2, reverb_decay=1.5,
diff --git a/tracks/voltage.py b/tracks/voltage.py
index 3819841..31c1b8c 100644
--- a/tracks/voltage.py
+++ b/tracks/voltage.py
@@ -424,6 +424,24 @@ play_pattern(pulse, pulse_line, 4, vel_offset=-25)
 for _ in range(4):
     pulse.rest(Duration.WHOLE)
 
+# ── SYNC — hard sync oscillator, enters late ───────────────────
+sync = score.part("sync", synth="hard_sync", volume=0.25,
+                  lowpass=4000, distortion=0.2, distortion_drive=2.5,
+                  reverb=0.15, reverb_type="spring",
+                  delay=0.15, delay_time=0.234, delay_feedback=0.2,
+                  pan=-0.15)
+
+# Bars 1-48: silence
+for _ in range(48):
+    sync.rest(Duration.WHOLE)
+
+# Bars 49-72: plays saw_line_a pattern
+play_pattern(sync, saw_line_a, 24)
+
+# Bars 73-96: silence
+for _ in range(24):
+    sync.rest(Duration.WHOLE)
+
 # ── KICK — enters at bar 41 ───────────────────────────────────
 K = DrumSound.KICK
 kick = score.part("kick", volume=1.0, humanize=0.02,