diff --git a/src/engine/engine.h b/src/engine/engine.h
index 85da26ea9..47146550c 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -53,8 +53,8 @@
 #define EXTERN_BUSY_BEGIN_SOFT e->softLocked=true; e->isBusy.lock();
 #define EXTERN_BUSY_END e->isBusy.unlock(); e->softLocked=false;
 
-#define DIV_VERSION "dev152"
-#define DIV_ENGINE_VERSION 152
+#define DIV_VERSION "dev153"
+#define DIV_ENGINE_VERSION 153
 // for imports
 #define DIV_VERSION_MOD 0xff01
 #define DIV_VERSION_FC 0xff02
diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index 0ca5dff69..c184d20ac 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -2715,6 +2715,15 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       }
     }
 
+    // SrgaPCM slide compat
+    if (ds.version<153) {
+      for (int i=0; i<ds.systemLen; i++) {
+        if (ds.system[i]==DIV_SYSTEM_SEGAPCM || ds.system[i]==DIV_SYSTEM_SEGAPCM_COMPAT) {
+          ds.systemFlags[i].set("oldSlides",true);
+        }
+      }
+    }
+
     if (active) quitDispatch();
     BUSY_BEGIN_SOFT;
     saveLock.lock();
diff --git a/src/engine/platform/segapcm.cpp b/src/engine/platform/segapcm.cpp
index 9c7f6a631..6a7c14577 100644
--- a/src/engine/platform/segapcm.cpp
+++ b/src/engine/platform/segapcm.cpp
@@ -72,7 +72,7 @@ void DivPlatformSegaPCM::tick(bool sysTick) {
       chan[i].handleArp();
     } else if (chan[i].std.arp.had) {
       if (!chan[i].inPorta) {
-        chan[i].baseFreq=(parent->calcArp(chan[i].note,chan[i].std.arp.val)<<6);
+        chan[i].baseFreq=(parent->calcArp(chan[i].note,chan[i].std.arp.val)<<7);
       }
       chan[i].freqChanged=true;
     }
@@ -106,21 +106,22 @@ void DivPlatformSegaPCM::tick(bool sysTick) {
     }
 
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=chan[i].baseFreq+(chan[i].pitch>>1)-64;
+      chan[i].freq=chan[i].baseFreq+(chan[i].pitch)-128+(oldSlides?0:chan[i].pitch2);
       if (!parent->song.oldArpStrategy) {
         if (chan[i].fixedArp) {
-          chan[i].freq=(chan[i].baseNoteOverride<<6)+(chan[i].pitch>>1)-64+chan[i].pitch2;
+          chan[i].freq=(chan[i].baseNoteOverride<<7)+chan[i].pitch-128+(chan[i].pitch2<<(oldSlides?1:0));
         } else {
-          chan[i].freq+=chan[i].arpOff<<6;
+          chan[i].freq+=chan[i].arpOff<<7;
         }
       }
+      if (oldSlides) chan[i].freq&=~1;
       if (chan[i].furnacePCM) {
         double off=1.0;
         if (chan[i].pcm.sample>=0 && chan[i].pcm.sample<parent->song.sampleLen) {
           DivSample* s=parent->getSample(chan[i].pcm.sample);
           off=(double)s->centerRate/8363.0;
         }
-        chan[i].pcm.freq=MIN(255,(15625+(off*parent->song.tuning*pow(2.0,double(chan[i].freq+256)/(64.0*12.0)))*255)/31250)+chan[i].pitch2;
+        chan[i].pcm.freq=MIN(255,(15625+(off*parent->song.tuning*pow(2.0,double(chan[i].freq+512)/(128.0*12.0)))*255)/31250)+(oldSlides?chan[i].pitch2:0);
         rWrite(7+(i<<3),chan[i].pcm.freq);
       }
       chan[i].freqChanged=false;
@@ -201,7 +202,7 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
         }
         if (c.value!=DIV_NOTE_NULL) {
           chan[c.chan].note=c.value;
-          chan[c.chan].baseFreq=(c.value<<6);
+          chan[c.chan].baseFreq=(c.value<<7);
           chan[c.chan].freqChanged=true;
         }
         chan[c.chan].furnacePCM=true;
@@ -289,17 +290,18 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
-      int destFreq=(c.value2<<6);
+      int destFreq=(c.value2<<7);
       int newFreq;
+      int mul=(oldSlides || parent->song.linearPitch!=2)?8:parent->song.pitchSlideSpeed;
       bool return2=false;
       if (destFreq>chan[c.chan].baseFreq) {
-        newFreq=chan[c.chan].baseFreq+c.value*4;
+        newFreq=chan[c.chan].baseFreq+c.value*mul;
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=chan[c.chan].baseFreq-c.value*4;
+        newFreq=chan[c.chan].baseFreq-c.value*mul;
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
@@ -314,7 +316,7 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_LEGATO: {
-      chan[c.chan].baseFreq=(c.value<<6);
+      chan[c.chan].baseFreq=(c.value<<7);
       chan[c.chan].freqChanged=true;
       break;
     }
@@ -337,7 +339,7 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
       return 127;
       break;
     case DIV_CMD_PRE_PORTA:
-      if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=(chan[c.chan].note<<6);
+      if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=(chan[c.chan].note<<7);
       chan[c.chan].inPorta=c.value;
       break;
     case DIV_CMD_PRE_NOTE:
@@ -504,6 +506,8 @@ void DivPlatformSegaPCM::setFlags(const DivConfig& flags) {
   for (int i=0; i<16; i++) {
     oscBuf[i]->rate=rate;
   }
+
+  oldSlides=flags.getBool("oldSlides",false);
 }
 
 int DivPlatformSegaPCM::getOutputCount() {
diff --git a/src/engine/platform/segapcm.h b/src/engine/platform/segapcm.h
index 9e2ad5df1..b818306b1 100644
--- a/src/engine/platform/segapcm.h
+++ b/src/engine/platform/segapcm.h
@@ -65,6 +65,7 @@ class DivPlatformSegaPCM: public DivDispatch {
     segapcm_device pcm;
     int delay;
     int pcmL, pcmR, pcmCycles;
+    bool oldSlides;
     unsigned char sampleBank;
     unsigned char lastBusy;
 
diff --git a/src/gui/sysConf.cpp b/src/gui/sysConf.cpp
index 77bc6c726..3e36ad857 100644
--- a/src/gui/sysConf.cpp
+++ b/src/gui/sysConf.cpp
@@ -1770,6 +1770,21 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
       }
       break;
     }
+    case DIV_SYSTEM_SEGAPCM:
+    case DIV_SYSTEM_SEGAPCM_COMPAT: {
+      bool oldSlides=flags.getBool("oldSlides",false);
+
+      if (ImGui::Checkbox("Legacy slides and pitch (compatibility)",&oldSlides)) {
+        altered=true;
+      }
+
+      if (altered) {
+        e->lockSave([&]() {
+          flags.set("oldSlides",oldSlides);
+        });
+      }
+      break;
+    }
     case DIV_SYSTEM_SM8521:/*  {
       bool noAntiClick=flags.getBool("noAntiClick",false);