diff --git a/demos/ay8930/AY8930Shuffle.fur b/demos/ay8930/AY8930Shuffle.fur
new file mode 100644
index 000000000..68931cf09
Binary files /dev/null and b/demos/ay8930/AY8930Shuffle.fur differ
diff --git a/demos/sms/FlowOfSN7.fur b/demos/sms/FlowOfSN7.fur
new file mode 100644
index 000000000..643686cc0
Binary files /dev/null and b/demos/sms/FlowOfSN7.fur differ
diff --git a/src/engine/platform/sound/c64_fp/SID.cpp b/src/engine/platform/sound/c64_fp/SID.cpp
index a996d2230..03c778c90 100644
--- a/src/engine/platform/sound/c64_fp/SID.cpp
+++ b/src/engine/platform/sound/c64_fp/SID.cpp
@@ -351,7 +351,7 @@ void SID::write(int offset, unsigned char value)
         break;
 
     case 0x04: // Voice #1 control register
-        voice[0]->writeCONTROL_REG(muted[0] ? 0 : value);
+        voice[0]->writeCONTROL_REG(value);
         break;
 
     case 0x05: // Voice #1 Attack and Decay length
@@ -379,7 +379,7 @@ void SID::write(int offset, unsigned char value)
         break;
 
     case 0x0b: // Voice #2 control register
-        voice[1]->writeCONTROL_REG(muted[1] ? 0 : value);
+        voice[1]->writeCONTROL_REG(value);
         break;
 
     case 0x0c: // Voice #2 Attack and Decay length
@@ -407,7 +407,7 @@ void SID::write(int offset, unsigned char value)
         break;
 
     case 0x12: // Voice #3 control register
-        voice[2]->writeCONTROL_REG(muted[2] ? 0 : value);
+        voice[2]->writeCONTROL_REG(value);
         break;
 
     case 0x13: // Voice #3 Attack and Decay length
diff --git a/src/engine/platform/sound/c64_fp/SID.h b/src/engine/platform/sound/c64_fp/SID.h
index 85b6a4e4d..77d7706d4 100644
--- a/src/engine/platform/sound/c64_fp/SID.h
+++ b/src/engine/platform/sound/c64_fp/SID.h
@@ -320,11 +320,11 @@ int SID::output()
     const int v2 = voice[1]->output(voice[0]->wave());
     const int v3 = voice[2]->output(voice[1]->wave());
 
-    lastChanOut[0]=v1;
-    lastChanOut[1]=v2;
-    lastChanOut[2]=v3;
+    lastChanOut[0]=muted[0]?0:v1;
+    lastChanOut[1]=muted[1]?0:v2;
+    lastChanOut[2]=muted[2]?0:v3;
 
-    return externalFilter->clock(filter->clock(v1, v2, v3));
+    return externalFilter->clock(filter->clock(muted[0]?0:v1, muted[1]?0:v2, muted[2]?0:v3));
 }