fix two possible pitch slide regressions

now let's fix blue crow

src/engine/platform/genesis.cpp

@@ -638,6 +638,10 @@ void DivPlatformGenesis::notifyInsDeletion(void* ins) {
   psg.notifyInsDeletion(ins);
 }
 
+int DivPlatformGenesis::getPortaFloor(int ch) {
+  return (ch>5)?12:0;
+}
+
 void DivPlatformGenesis::setFlags(unsigned int flags) {
   if (flags==2) {
     chipClock=8000000.0;

src/engine/platform/genesis.h

@@ -85,6 +85,7 @@ class DivPlatformGenesis: public DivDispatch {
     void setFlags(unsigned int flags);
     void notifyInsChange(int ins);
     void notifyInsDeletion(void* ins);
+    int getPortaFloor(int ch);
     int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
     void quit();
     ~DivPlatformGenesis();

src/engine/platform/genesisext.cpp

@@ -334,6 +334,10 @@ void DivPlatformGenesisExt::notifyInsChange(int ins) {
   }
 }
 
+int DivPlatformGenesisExt::getPortaFloor(int ch) {
+  return (ch>8)?12:0;
+}
+
 int DivPlatformGenesisExt::init(DivEngine* parent, int channels, int sugRate, unsigned int flags) {
   DivPlatformGenesis::init(parent,channels,sugRate,flags);
   for (int i=0; i<4; i++) {

src/engine/platform/genesisext.h

@@ -27,6 +27,7 @@ class DivPlatformGenesisExt: public DivPlatformGenesis {
     bool keyOffAffectsArp(int ch);
     bool keyOffAffectsPorta(int ch);
     void notifyInsChange(int ins);
+    int getPortaFloor(int ch);
     int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
     void quit();
     ~DivPlatformGenesisExt();

src/engine/playback.cpp

@@ -685,6 +685,7 @@ void DivEngine::processRow(int i, bool afterDelay) {
       chan[i].portaNote=-1;
       chan[i].portaSpeed=-1;
       chan[i].scheduledSlideReset=false;
+      chan[i].inPorta=false;
     }
     if (!chan[i].keyOn && chan[i].volume>chan[i].volMax) {
       chan[i].volume=chan[i].volMax;