diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index 41409876..42dba6f4 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -102,6 +102,17 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
       opChan[ch].keyOn=false;
       opChan[ch].active=false;
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+      if (noExtMacros) break;
+      opChan[ch].keyOff=true;
+      opChan[ch].keyOn=false;
+      opChan[ch].active=false;
+      opChan[ch].std.release();
+      break;
+    case DIV_CMD_ENV_RELEASE:
+      if (noExtMacros) break;
+      opChan[ch].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       opChan[ch].vol=c.value;
       if (!opChan[ch].std.vol.has) {