diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2540f8133..980062769 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,7 +11,7 @@ defaults:
     shell: bash
 
 env:
-  BUILD_TYPE: Release
+  BUILD_TYPE: Debug
 
 jobs:
   build:
diff --git a/demos/multichip/colab.fur b/demos/multichip/colab.fur
new file mode 100644
index 000000000..4d104da1a
Binary files /dev/null and b/demos/multichip/colab.fur differ
diff --git a/demos/x16/dance with me.fur b/demos/x16/dance with me.fur
new file mode 100644
index 000000000..7cb53305a
Binary files /dev/null and b/demos/x16/dance with me.fur differ
diff --git a/src/engine/platform/ay8930.cpp b/src/engine/platform/ay8930.cpp
index 50b36a64f..3dc8eedbc 100644
--- a/src/engine/platform/ay8930.cpp
+++ b/src/engine/platform/ay8930.cpp
@@ -297,7 +297,7 @@ void DivPlatformAY8930::tick(bool sysTick) {
       }
     }
     if (chan[i].std.ex1.had) { // duty
-      rWrite(0x16+i,chan[i].std.ex1.val);
+      immWrite(0x16+i,chan[i].std.ex1.val);
     }
     if (chan[i].std.ex2.had) {
       chan[i].envelope.mode=chan[i].std.ex2.val;
diff --git a/src/engine/platform/c64.cpp b/src/engine/platform/c64.cpp
index 4d1caf9ab..d52a5dd00 100644
--- a/src/engine/platform/c64.cpp
+++ b/src/engine/platform/c64.cpp
@@ -148,7 +148,7 @@ void DivPlatformC64::tick(bool sysTick) {
     if (chan[i].std.pitch.had) {
       if (chan[i].std.pitch.mode) {
         chan[i].pitch2+=chan[i].std.pitch.val;
-        CLAMP_VAR(chan[i].pitch2,-32768,32767);
+        CLAMP_VAR(chan[i].pitch2,-65535,65535);
       } else {
         chan[i].pitch2=chan[i].std.pitch.val;
       }
@@ -188,6 +188,7 @@ void DivPlatformC64::tick(bool sysTick) {
 
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,false,8,chan[i].pitch2,chipClock,CHIP_FREQBASE);
+      if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].freq>0xffff) chan[i].freq=0xffff;
       if (chan[i].keyOn) {
         rWrite(i*7+5,(chan[i].attack<<4)|(chan[i].decay));
diff --git a/src/engine/platform/lynx.cpp b/src/engine/platform/lynx.cpp
index 7ae060b7e..07be2d6f6 100644
--- a/src/engine/platform/lynx.cpp
+++ b/src/engine/platform/lynx.cpp
@@ -509,12 +509,12 @@ DivPlatformLynx::MikeyFreqDiv::MikeyFreqDiv(int frequency) {
   if (top>7)
   {
     clockDivider=top-7;
-    backup=frequency>>(top-7);
+    backup=clamped>>(top-7);
   }
   else
   {
     clockDivider=0;
-    backup=frequency;
+    backup=clamped;
   }
 }
 
diff --git a/src/engine/platform/qsound.cpp b/src/engine/platform/qsound.cpp
index 299e980a6..57ab138c6 100644
--- a/src/engine/platform/qsound.cpp
+++ b/src/engine/platform/qsound.cpp
@@ -707,11 +707,11 @@ const void* DivPlatformQSound::getSampleMem(int index) {
 }
 
 size_t DivPlatformQSound::getSampleMemCapacity(int index) {
-  return (index == 0 || index == 1) ? 16777216 : 0;
+  return index == 0 ? 16777216 : index == 1 ? MAX(0,16777216 - sampleMemUsage) : 0;
 }
 
 size_t DivPlatformQSound::getSampleMemUsage(int index) {
-  return index == 0 ? sampleMemLen : index == 1 ? sampleMemLenBS : 0;
+  return index == 0 ? sampleMemLen : index == 1 ? MAX(0,sampleMemLenBS - sampleMemUsage) : 0;
 }
 
 bool DivPlatformQSound::isSampleLoaded(int index, int sample) {
@@ -766,6 +766,7 @@ void DivPlatformQSound::renderSamples(int sysID) {
   sampleMemLen=memPos+256;
 
   memPos=(memPos+0xffff)&0xff0000;
+  sampleMemUsage=memPos;
 
   for (int i=0; i<parent->song.sampleLen; i++) {
     DivSample* s=parent->song.sample[i];
@@ -818,6 +819,7 @@ int DivPlatformQSound::init(DivEngine* p, int channels, int sugRate, const DivCo
   sampleMem=new unsigned char[getSampleMemCapacity()];
   sampleMemLen=0;
   sampleMemLenBS=0;
+  sampleMemUsage=0;
   chip.rom_data=sampleMem;
   chip.rom_mask=0xffffff;
   reset();
diff --git a/src/engine/platform/qsound.h b/src/engine/platform/qsound.h
index f0b0ed03b..c04514ed8 100644
--- a/src/engine/platform/qsound.h
+++ b/src/engine/platform/qsound.h
@@ -50,6 +50,7 @@ class DivPlatformQSound: public DivDispatch {
   unsigned char* sampleMem;
   size_t sampleMemLen;
   size_t sampleMemLenBS;
+  size_t sampleMemUsage;
   bool sampleLoaded[256];
   bool sampleLoadedBS[256];
   struct qsound_chip chip;
diff --git a/src/engine/platform/x1_010.cpp b/src/engine/platform/x1_010.cpp
index 34973a99d..12e6280d9 100644
--- a/src/engine/platform/x1_010.cpp
+++ b/src/engine/platform/x1_010.cpp
@@ -362,7 +362,7 @@ void DivPlatformX1_010::tick(bool sysTick) {
     if (chan[i].std.pitch.had) {
       if (chan[i].std.pitch.mode) {
         chan[i].pitch2+=chan[i].std.pitch.val;
-        CLAMP_VAR(chan[i].pitch2,-32768,32767);
+        CLAMP_VAR(chan[i].pitch2,-65535,65535);
       } else {
         chan[i].pitch2=chan[i].std.pitch.val;
       }
@@ -484,6 +484,7 @@ void DivPlatformX1_010::tick(bool sysTick) {
         if (chan[i].freq>255) chan[i].freq=255;
         chWrite(i,2,chan[i].freq&0xff);
       } else {
+        if (chan[i].freq<0) chan[i].freq=0;
         if (chan[i].freq>65535) chan[i].freq=65535;
         chWrite(i,2,chan[i].freq&0xff);
         chWrite(i,3,(chan[i].freq>>8)&0xff);
diff --git a/src/engine/platform/zxbeeper.cpp b/src/engine/platform/zxbeeper.cpp
index 7bd992f81..f8762c7f2 100644
--- a/src/engine/platform/zxbeeper.cpp
+++ b/src/engine/platform/zxbeeper.cpp
@@ -90,7 +90,7 @@ void DivPlatformZXBeeper::tick(bool sysTick) {
     if (chan[i].std.pitch.had) {
       if (chan[i].std.pitch.mode) {
         chan[i].pitch2+=chan[i].std.pitch.val;
-        CLAMP_VAR(chan[i].pitch2,-32768,32767);
+        CLAMP_VAR(chan[i].pitch2,-65535,65535);
       } else {
         chan[i].pitch2=chan[i].std.pitch.val;
       }
@@ -99,6 +99,7 @@ void DivPlatformZXBeeper::tick(bool sysTick) {
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       if (chan[i].active) {
         chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
+        if (chan[i].freq<0) chan[i].freq=0;
         if (chan[i].freq>65535) chan[i].freq=65535;
       }
       if (chan[i].keyOn) {
diff --git a/src/gui/about.cpp b/src/gui/about.cpp
index fd229ecf6..532cb6bde 100644
--- a/src/gui/about.cpp
+++ b/src/gui/about.cpp
@@ -63,6 +63,7 @@ const char* aboutLine[]={
   "akumanatt",
   "AmigaX",
   "AURORA*FIELDS",
+  "battybeats",
   "BlueElectric05",
   "breakthetargets",
   "brickblock369",