diff --git a/src/engine/platform/dummy.cpp b/src/engine/platform/dummy.cpp
index d1e121313..fa773cb51 100644
--- a/src/engine/platform/dummy.cpp
+++ b/src/engine/platform/dummy.cpp
@@ -6,7 +6,8 @@ void DivPlatformDummy::acquire(int& l, int& r) {
   l=0;
   for (unsigned char i=0; i<chans; i++) {
     if (chan[i].active) {
-      l+=((chan[i].pos>=0x8000)?chan[i].vol:-chan[i].vol)<<5;
+      l+=((chan[i].pos>=0x8000)?chan[i].vol:-chan[i].vol)*chan[i].amp;
+      
       chan[i].pos+=chan[i].freq;
     }
   }
@@ -14,20 +15,25 @@ void DivPlatformDummy::acquire(int& l, int& r) {
 }
 
 void DivPlatformDummy::tick() {
+  for (unsigned char i=0; i<chans; i++) {
+    chan[i].amp--;
+    if (chan[i].amp<0) chan[i].amp=0;
+  }
 }
 
 int DivPlatformDummy::dispatch(DivCommand c) {
-  printf("command: %d %d %d %d\n",c.cmd,c.chan,c.value,c.value2);
   switch (c.cmd) {
     case DIV_CMD_NOTE_ON:
       chan[c.chan].freq=16.4f*pow(2.0f,((float)c.value/12.0f));
       chan[c.chan].active=true;
+      chan[c.chan].amp=64;
       break;
     case DIV_CMD_NOTE_OFF:
       chan[c.chan].active=false;
       break;
     case DIV_CMD_VOLUME:
       chan[c.chan].vol=c.value;
+      if (chan[c.chan].vol>15) chan[c.chan].vol=15;
       break;
     case DIV_CMD_GET_VOLUME:
       return chan[c.chan].vol;
diff --git a/src/engine/platform/dummy.h b/src/engine/platform/dummy.h
index ad6381721..595c1d8ce 100644
--- a/src/engine/platform/dummy.h
+++ b/src/engine/platform/dummy.h
@@ -8,7 +8,8 @@ class DivPlatformDummy: public DivDispatch {
     unsigned short pos;
     bool active;
     unsigned char vol;
-    Channel(): freq(0), pos(0), active(false), vol(0) {}
+    signed char amp;
+    Channel(): freq(0), pos(0), active(false), vol(0), amp(64) {}
   };
   Channel chan[17];
   unsigned char chans;