diff --git a/amy b/amy
index 2f48d7e7..638d07b9 160000
--- a/amy
+++ b/amy
@@ -1 +1 @@
-Subproject commit 2f48d7e79a93f467e2a26e7ba13445e3ce1b73eb
+Subproject commit 638d07b9bc948bee7c2a209d8a735a4fba7e5f01
diff --git a/tulip/shared/py/midi.py b/tulip/shared/py/midi.py
index 01357be2..4d6a4294 100644
--- a/tulip/shared/py/midi.py
+++ b/tulip/shared/py/midi.py
@@ -189,6 +189,7 @@ class Synth:
     Provides methods:
       synth.note_on(midi_note, velocity, time=None)
       synth.note_off(midi_note, time=None)
+      synth.all_notes_off()
       synth.program_change(patch_num) changes preset for all voices.
       synth.control_change(control, value) modifies a parameter for all voices.
     Provides read-back attributes (for voices.py UI):
@@ -393,6 +394,10 @@ def note_off(self, note, pcm_patch=0, custom=False, time=None):
             amy.send(time=time, osc=osc, vel=0)
             del self.pcm_patch_to_osc[note]
 
+    def all_notes_off(self):
+        for i in self.oscs:
+            amy.send(osc=osc, vel=0)
+
     # Rest of Synth protocol doesn't do anything for PitchedPCM.
     def sustain(self, state):
         pass
@@ -410,52 +415,6 @@ def set_patch_state(self, state):
         pass
 
 
-class DrumSynth:
-    """Simplified Synth for Drum channel (10). Plays one patch per note at its default pitch. Not used right now. """
-    PCM_PATCHES = 29
-
-    def __init__(self, num_voices=10):
-        self.oscs = list(range(amy.AMY_OSCS - num_voices, amy.AMY_OSCS))
-        self.next_osc = 0
-        self.note_to_osc = {}
-        # Fields used by UI
-        self.amy_voices = self.oscs  # Actually osc numbers not amy voices.
-        self.patch_number = None  # Patch number is used to detect Juno synths
-        self.patch_state = None
-
-    def note_on(self, note, velocity, time=None):
-        osc = self.oscs[self.next_osc]
-        self.next_osc = (self.next_osc + 1) % len(self.oscs)
-        amy.send(time=time, osc=osc, wave=amy.PCM,
-             patch=note % DrumSynth.PCM_PATCHES, vel=velocity, freq=0)
-        self.note_to_osc[note] = osc
-
-    def note_off(self, note, time=None):
-        # Drums don't really need note-offs, but handle them anyway.
-        try:
-            osc = self.note_to_osc[note]
-            amy.send(time=time, osc=osc, vel=0)
-            del self.note_to_osc[note]
-        except KeyError:
-            # We didn't recognize the note number; never mind.
-            pass
-
-    # Rest of Synth protocol doesn't do anything for drums.
-    def sustain(self, state):
-        pass
-
-    def program_change(self, patch_number):
-        pass
-
-    def control_change(self, control, value):
-        pass
-
-    def get_patch_state(self):
-        return None
-
-    def set_patch_state(self, state):
-        pass
-
 
 arpeggiator = arpegg.ArpeggiatorSynth(synth=None)