diff --git a/src/engine/platform/ay.h b/src/engine/platform/ay.h
index 430d5631..e8d7efce 100644
--- a/src/engine/platform/ay.h
+++ b/src/engine/platform/ay.h
@@ -80,7 +80,8 @@ class DivPlatformAY8910: public DivDispatch {
         nextPSGMode(PSGMode(1)),
         dac(DAC()),
         autoEnvNum(0),
-        autoEnvDen(0) {}
+        autoEnvDen(0),
+        konCycles(0) {}
     };
     Channel chan[3];
     bool isMuted[3];
diff --git a/src/engine/platform/ay8930.h b/src/engine/platform/ay8930.h
index d51ebf0d..0bd2171a 100644
--- a/src/engine/platform/ay8930.h
+++ b/src/engine/platform/ay8930.h
@@ -90,7 +90,8 @@ class DivPlatformAY8930: public DivDispatch {
         dac(DAC()),
         autoEnvNum(0),
         autoEnvDen(0),
-        duty(4) {}
+        duty(4),
+        konCycles(0) {}
     };
     Channel chan[3];
     bool isMuted[3];
diff --git a/src/engine/platform/fmshared_OPN.h b/src/engine/platform/fmshared_OPN.h
index 19eec0aa..a8ec6772 100644
--- a/src/engine/platform/fmshared_OPN.h
+++ b/src/engine/platform/fmshared_OPN.h
@@ -133,6 +133,7 @@ class DivPlatformOPN: public DivPlatformFMBase {
         freqH(0),
         freqL(0),
         portaPauseFreq(0),
+        konCycles(0),
         mask(true) {}
     };
 
diff --git a/src/engine/platform/msm6258.cpp b/src/engine/platform/msm6258.cpp
index 04ed970a..2d38e6f7 100644
--- a/src/engine/platform/msm6258.cpp
+++ b/src/engine/platform/msm6258.cpp
@@ -355,53 +355,6 @@ void DivPlatformMSM6258::notifyInsChange(int ins) {
 void DivPlatformMSM6258::notifyInsDeletion(void* ins) {
 }
 
-const void* DivPlatformMSM6258::getSampleMem(int index) {
-  return index == 0 ? adpcmMem : NULL;
-}
-
-size_t DivPlatformMSM6258::getSampleMemCapacity(int index) {
-  return index == 0 ? 262144 : 0;
-}
-
-size_t DivPlatformMSM6258::getSampleMemUsage(int index) {
-  return index == 0 ? adpcmMemLen : 0;
-}
-
-bool DivPlatformMSM6258::isSampleLoaded(int index, int sample) {
-  if (index!=0) return false;
-  if (sample<0 || sample>255) return false;
-  return sampleLoaded[sample];
-}
-
-void DivPlatformMSM6258::renderSamples(int sysID) {
-  memset(adpcmMem,0,getSampleMemCapacity(0));
-  memset(sampleLoaded,0,256*sizeof(bool));
-
-  // sample data
-  size_t memPos=0;
-  int sampleCount=parent->song.sampleLen;
-  if (sampleCount>128) sampleCount=128;
-  for (int i=0; i<sampleCount; i++) {
-    DivSample* s=parent->song.sample[i];
-    if (!s->renderOn[0][sysID]) continue;
-
-    int paddedLen=s->lengthVOX;
-    if (memPos>=getSampleMemCapacity(0)) {
-      logW("out of ADPCM memory for sample %d!",i);
-      break;
-    }
-    if (memPos+paddedLen>=getSampleMemCapacity(0)) {
-      memcpy(adpcmMem+memPos,s->dataVOX,getSampleMemCapacity(0)-memPos);
-      logW("out of ADPCM memory for sample %d!",i);
-    } else {
-      memcpy(adpcmMem+memPos,s->dataVOX,paddedLen);
-      sampleLoaded[i]=true;
-    }
-    memPos+=paddedLen;
-  }
-  adpcmMemLen=memPos+256;
-}
-
 void DivPlatformMSM6258::setFlags(const DivConfig& flags) {
   switch (flags.getInt("clockSel",0)) {
     case 3:
@@ -426,8 +379,6 @@ void DivPlatformMSM6258::setFlags(const DivConfig& flags) {
 
 int DivPlatformMSM6258::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
   parent=p;
-  adpcmMem=new unsigned char[getSampleMemCapacity(0)];
-  adpcmMemLen=0;
   dumpWrites=false;
   skipRegisterWrites=false;
   updateOsc=0;
@@ -447,7 +398,6 @@ void DivPlatformMSM6258::quit() {
     delete oscBuf[i];
   }
   delete msm;
-  delete[] adpcmMem;
 }
 
 DivPlatformMSM6258::~DivPlatformMSM6258() {
diff --git a/src/engine/platform/msm6258.h b/src/engine/platform/msm6258.h
index 28f04f92..d64d40b4 100644
--- a/src/engine/platform/msm6258.h
+++ b/src/engine/platform/msm6258.h
@@ -48,9 +48,6 @@ class DivPlatformMSM6258: public DivDispatch {
     okim6258_device* msm;
     unsigned char lastBusy;
 
-    unsigned char* adpcmMem;
-    size_t adpcmMemLen;
-    bool sampleLoaded[256];
     unsigned char sampleBank, msmPan, msmDivider, rateSel, msmClock, clockSel;
     signed char msmDividerCount, msmClockCount;
     short msmOut;
@@ -80,12 +77,7 @@ class DivPlatformMSM6258: public DivDispatch {
     void poke(std::vector<DivRegWrite>& wlist);
     void setFlags(const DivConfig& flags);
     const char** getRegisterSheet();
-    const void* getSampleMem(int index);
-    size_t getSampleMemCapacity(int index);
-    size_t getSampleMemUsage(int index);
-    bool isSampleLoaded(int index, int sample);
-    void renderSamples(int chipID);
-    
+
     int init(DivEngine* parent, int channels, int sugRate, const DivConfig& flags);
     void quit();
     ~DivPlatformMSM6258();
diff --git a/src/engine/platform/qsound.h b/src/engine/platform/qsound.h
index 18eb886b..dbdffd05 100644
--- a/src/engine/platform/qsound.h
+++ b/src/engine/platform/qsound.h
@@ -35,6 +35,7 @@ class DivPlatformQSound: public DivDispatch {
       SharedChannel<int>(255),
       resVol(4095),
       sample(-1),
+      wave(-1),
       panning(0x10),
       echo(0),
       useWave(false),
diff --git a/src/engine/platform/rf5c68.h b/src/engine/platform/rf5c68.h
index c22688c3..2703a290 100644
--- a/src/engine/platform/rf5c68.h
+++ b/src/engine/platform/rf5c68.h
@@ -35,6 +35,7 @@ class DivPlatformRF5C68: public DivDispatch {
       SharedChannel<int>(255),
       audPos(0),
       sample(-1),
+      wave(-1),
       panning(255),
       setPos(false),
       macroVolMul(64) {}
diff --git a/src/engine/platform/ymz280b.h b/src/engine/platform/ymz280b.h
index d2f2f1bb..810d5223 100644
--- a/src/engine/platform/ymz280b.h
+++ b/src/engine/platform/ymz280b.h
@@ -35,6 +35,7 @@ class DivPlatformYMZ280B: public DivDispatch {
       SharedChannel<int>(255),
       audPos(0),
       sample(-1),
+      wave(-1),
       panning(8),
       setPos(false),
       isNewYMZ(false),