diff --git a/src/engine/dispatch.h b/src/engine/dispatch.h
index 3118eef2f..528dcebc5 100644
--- a/src/engine/dispatch.h
+++ b/src/engine/dispatch.h
@@ -99,7 +99,7 @@ class DivDispatch {
     virtual void tick();
 
     virtual bool isStereo();
-    virtual bool keyOffAffectsArp();
+    virtual bool keyOffAffectsArp(int ch);
 
     /**
      * initialize this DivDispatch.
diff --git a/src/engine/platform/abstract.cpp b/src/engine/platform/abstract.cpp
index b716c77b2..48332e53a 100644
--- a/src/engine/platform/abstract.cpp
+++ b/src/engine/platform/abstract.cpp
@@ -14,7 +14,7 @@ bool DivDispatch::isStereo() {
   return false;
 }
 
-bool DivDispatch::keyOffAffectsArp() {
+bool DivDispatch::keyOffAffectsArp(int ch) {
   return false;
 }
 
diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index b7e72e534..cabdf9c07 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -344,6 +344,10 @@ bool DivPlatformGenesis::isStereo() {
   return true;
 }
 
+bool DivPlatformGenesis::keyOffAffectsArp(int ch) {
+  return (ch>5);
+}
+
 int DivPlatformGenesis::init(DivEngine* p, int channels, int sugRate) {
   parent=p;
   rate=213068;
diff --git a/src/engine/platform/genesis.h b/src/engine/platform/genesis.h
index c4292d47a..29af32e74 100644
--- a/src/engine/platform/genesis.h
+++ b/src/engine/platform/genesis.h
@@ -52,6 +52,7 @@ class DivPlatformGenesis: public DivDispatch {
     int dispatch(DivCommand c);
     void tick();
     bool isStereo();
+    bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate);
 };
 #endif
diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index c7f1ce71d..dfe26777c 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -254,6 +254,10 @@ void DivPlatformGenesisExt::tick() {
   }
 }
 
+bool DivPlatformGenesisExt::keyOffAffectsArp(int ch) {
+  return (ch>8);
+}
+
 int DivPlatformGenesisExt::init(DivEngine* parent, int channels, int sugRate) {
   DivPlatformGenesis::init(parent,channels,sugRate);
 
diff --git a/src/engine/platform/genesisext.h b/src/engine/platform/genesisext.h
index 56c2741de..1ce6264d4 100644
--- a/src/engine/platform/genesisext.h
+++ b/src/engine/platform/genesisext.h
@@ -17,5 +17,6 @@ class DivPlatformGenesisExt: public DivPlatformGenesis {
   public:
     int dispatch(DivCommand c);
     void tick();
+    bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate);
 };
diff --git a/src/engine/platform/nes.cpp b/src/engine/platform/nes.cpp
index e015c2432..310108c0c 100644
--- a/src/engine/platform/nes.cpp
+++ b/src/engine/platform/nes.cpp
@@ -270,7 +270,7 @@ int DivPlatformNES::dispatch(DivCommand c) {
   return 1;
 }
 
-bool DivPlatformNES::keyOffAffectsArp() {
+bool DivPlatformNES::keyOffAffectsArp(int ch) {
   return true;
 }
 
diff --git a/src/engine/platform/nes.h b/src/engine/platform/nes.h
index d0c858d5d..490971c2b 100644
--- a/src/engine/platform/nes.h
+++ b/src/engine/platform/nes.h
@@ -39,7 +39,7 @@ class DivPlatformNES: public DivDispatch {
     void acquire(short* bufL, short* bufR, size_t start, size_t len);
     int dispatch(DivCommand c);
     void tick();
-    bool keyOffAffectsArp();
+    bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate);
 };
 
diff --git a/src/engine/platform/pce.cpp b/src/engine/platform/pce.cpp
index 6bc4bfa39..719ad3175 100644
--- a/src/engine/platform/pce.cpp
+++ b/src/engine/platform/pce.cpp
@@ -259,7 +259,7 @@ bool DivPlatformPCE::isStereo() {
   return true;
 }
 
-bool DivPlatformPCE::keyOffAffectsArp() {
+bool DivPlatformPCE::keyOffAffectsArp(int ch) {
   return true;
 }
 
diff --git a/src/engine/platform/pce.h b/src/engine/platform/pce.h
index d9c265475..f9ab3bb5d 100644
--- a/src/engine/platform/pce.h
+++ b/src/engine/platform/pce.h
@@ -54,7 +54,7 @@ class DivPlatformPCE: public DivDispatch {
     int dispatch(DivCommand c);
     void tick();
     bool isStereo();
-    bool keyOffAffectsArp();
+    bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate);
 };
 
diff --git a/src/engine/platform/sms.cpp b/src/engine/platform/sms.cpp
index 1748c5836..47d21e616 100644
--- a/src/engine/platform/sms.cpp
+++ b/src/engine/platform/sms.cpp
@@ -159,7 +159,7 @@ int DivPlatformSMS::dispatch(DivCommand c) {
   return 1;
 }
 
-bool DivPlatformSMS::keyOffAffectsArp() {
+bool DivPlatformSMS::keyOffAffectsArp(int ch) {
   return true;
 }
 
diff --git a/src/engine/platform/sms.h b/src/engine/platform/sms.h
index 6bb0ffb53..eeaed1217 100644
--- a/src/engine/platform/sms.h
+++ b/src/engine/platform/sms.h
@@ -34,7 +34,7 @@ class DivPlatformSMS: public DivDispatch {
     void acquire(short* bufL, short* bufR, size_t start, size_t len);
     int dispatch(DivCommand c);
     void tick();
-    bool keyOffAffectsArp();
+    bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate);
 };
 
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index 7638fe11b..6d8a3ab53 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -300,7 +300,7 @@ void DivEngine::processRow(int i, bool afterDelay) {
   } else if (!(pat->data[whatRow][0]==0 && pat->data[whatRow][1]==0)) {
     chan[i].note=pat->data[whatRow][0]+pat->data[whatRow][1]*12;
     if (!chan[i].keyOn) {
-      if (dispatch->keyOffAffectsArp()) {
+      if (dispatch->keyOffAffectsArp(i)) {
         chan[i].arp=0;
       }
     }