diff --git a/TODO.md b/TODO.md
index e8d551ab1..89a31eecf 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,5 +5,4 @@
 - (maybe) YM2612 CSM (no DualPCM)
 - port presets to new format
 - bug fixes
-- (maybe) ExtCh FM macros?
 - (maybe) advanced linear arpeggio? (run arp+slide simultaneously)
diff --git a/src/engine/platform/su.cpp b/src/engine/platform/su.cpp
index 116e0cde0..931225b49 100644
--- a/src/engine/platform/su.cpp
+++ b/src/engine/platform/su.cpp
@@ -595,6 +595,7 @@ int DivPlatformSoundUnit::init(DivEngine* p, int channels, int sugRate, const Di
     oscBuf[i]=new DivDispatchOscBuffer;
   }
   su=new SoundUnit();
+  sysIDCache=0;
   setFlags(flags);
   reset();
   return 8;