diff --git a/runtime/elem/builtins/MIDI.h b/runtime/elem/builtins/MIDI.h
index d42191a..f8eb59f 100644
--- a/runtime/elem/builtins/MIDI.h
+++ b/runtime/elem/builtins/MIDI.h
@@ -75,6 +75,12 @@ namespace elem
                         voiceMap[voiceIndex].lastModified = steadyClock + time;
                     }
                 }
+
+                if (event.message.isAllNotesOff())
+				{
+                    // Clear all voices on CC123 AllNotesOff
+					voiceMap.empty();
+				}
             });
 
             steadyClock += ctx.numSamples;