diff --git a/TODO.md b/TODO.md
index 62364e065..94e7f8df6 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,6 @@
 # to-do for 0.6pre1
 
+- fix an OPLL/OPL fixed drum freq regression caused by full linear pitch
 - piano/input pad
   - note input via piano
   - input pad
diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index c63601a4f..feae353d3 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -2669,16 +2669,19 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
   if (song.ins.size()>256) {
     logE("maximum number of instruments is 256!");
     lastError="maximum number of instruments is 256";
+    saveLock.unlock();
     return NULL;
   }
   if (song.wave.size()>256) {
     logE("maximum number of wavetables is 256!");
     lastError="maximum number of wavetables is 256";
+    saveLock.unlock();
     return NULL;
   }
   if (song.sample.size()>256) {
     logE("maximum number of samples is 256!");
     lastError="maximum number of samples is 256";
+    saveLock.unlock();
     return NULL;
   }
 
diff --git a/src/engine/platform/n163.cpp b/src/engine/platform/n163.cpp
index 9318b4f8b..691cdc04a 100644
--- a/src/engine/platform/n163.cpp
+++ b/src/engine/platform/n163.cpp
@@ -357,7 +357,9 @@ void DivPlatformN163::tick(bool sysTick) {
       chan[i].waveUpdated=false;
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq((((chan[i].baseFreq*chan[i].waveLen)*(chanMax+1))/16),chan[i].pitch,false,0,chan[i].pitch2,chipClock,CHIP_FREQBASE);
+      // TODO: what is this mess?
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,0,chan[i].pitch2,chipClock,CHIP_FREQBASE);
+      chan[i].freq=(((chan[i].freq*chan[i].waveLen)*(chanMax+1))/16);
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].freq>0x3ffff) chan[i].freq=0x3ffff;
       if (chan[i].keyOn) {
diff --git a/src/engine/platform/ym2203.cpp b/src/engine/platform/ym2203.cpp
index 10fde1f29..057c98b76 100644
--- a/src/engine/platform/ym2203.cpp
+++ b/src/engine/platform/ym2203.cpp
@@ -1057,19 +1057,19 @@ void DivPlatformYM2203::setSkipRegisterWrites(bool value) {
 }
 
 void DivPlatformYM2203::setFlags(unsigned int flags) {
-  unsigned char ayFlags=32;
+  unsigned char ayFlags=16;
   if (flags==3) {
     chipClock=3000000.0;
-    ayFlags=36;
+    ayFlags=20;
   } else if (flags==2) {
     chipClock=4000000.0;
-    ayFlags=35;
+    ayFlags=19;
   } else if (flags==1) {
     chipClock=COLOR_PAL*4.0/5.0;
-    ayFlags=33;
+    ayFlags=17;
   } else {
     chipClock=COLOR_NTSC;
-    ayFlags=32;
+    ayFlags=16;
   }
   ay->setFlags(ayFlags);
   rate=fm->sample_rate(chipClock);
@@ -1090,7 +1090,7 @@ int DivPlatformYM2203::init(DivEngine* p, int channels, int sugRate, unsigned in
   fm->set_fidelity(ymfm::OPN_FIDELITY_MIN);
   // YM2149, 2MHz
   ay=new DivPlatformAY8910;
-  ay->init(p,3,sugRate,35);
+  ay->init(p,3,sugRate,19);
   ay->toggleRegisterDump(true);
   setFlags(flags);
 
diff --git a/src/engine/platform/ym2203ext.cpp b/src/engine/platform/ym2203ext.cpp
index 9ca77e9fc..74bf9bac1 100644
--- a/src/engine/platform/ym2203ext.cpp
+++ b/src/engine/platform/ym2203ext.cpp
@@ -21,7 +21,7 @@
 #include "../engine.h"
 #include <math.h>
 
-#include "ym2610shared.h"
+#include "ym2203shared.h"
 #include "fmshared_OPN.h"
 
 int DivPlatformYM2203Ext::dispatch(DivCommand c) {
@@ -489,9 +489,6 @@ void DivPlatformYM2203Ext::forceIns() {
       chan[i].freqChanged=true;
     }
   }
-  for (int i=3; i<6; i++) {
-    chan[i].insChanged=true;
-  }
 
   ay->forceIns();
   ay->flushWrites();
diff --git a/src/engine/platform/ym2608.cpp b/src/engine/platform/ym2608.cpp
index b7e18e69d..730b62255 100644
--- a/src/engine/platform/ym2608.cpp
+++ b/src/engine/platform/ym2608.cpp
@@ -1459,7 +1459,7 @@ int DivPlatformYM2608::init(DivEngine* p, int channels, int sugRate, unsigned in
   }
   // YM2149, 2MHz
   ay=new DivPlatformAY8910;
-  ay->init(p,3,sugRate,35);
+  ay->init(p,3,sugRate,19);
   ay->toggleRegisterDump(true);
   reset();
   return 16;
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index ce3e4b7c1..f096f8f23 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -1454,7 +1454,7 @@ int DivPlatformYM2610::init(DivEngine* p, int channels, int sugRate, unsigned in
   fm=new ymfm::ym2610(iface);
   // YM2149, 2MHz
   ay=new DivPlatformAY8910;
-  ay->init(p,3,sugRate,35);
+  ay->init(p,3,sugRate,19);
   ay->toggleRegisterDump(true);
   reset();
   return 14;
diff --git a/src/engine/platform/ym2610b.cpp b/src/engine/platform/ym2610b.cpp
index 5a36aaaf4..c002f4b36 100644
--- a/src/engine/platform/ym2610b.cpp
+++ b/src/engine/platform/ym2610b.cpp
@@ -1432,7 +1432,7 @@ int DivPlatformYM2610B::init(DivEngine* p, int channels, int sugRate, unsigned i
   fm=new ymfm::ym2610b(iface);
   // YM2149, 2MHz
   ay=new DivPlatformAY8910;
-  ay->init(p,3,sugRate,35);
+  ay->init(p,3,sugRate,19);
   ay->toggleRegisterDump(true);
   reset();
   return 16;
diff --git a/src/engine/platform/zxbeeper.cpp b/src/engine/platform/zxbeeper.cpp
index 145cfe5b5..5fc3942fc 100644
--- a/src/engine/platform/zxbeeper.cpp
+++ b/src/engine/platform/zxbeeper.cpp
@@ -29,20 +29,11 @@ const char** DivPlatformZXBeeper::getRegisterSheet() {
 
 const char* DivPlatformZXBeeper::getEffectName(unsigned char effect) {
   switch (effect) {
-    case 0x10:
-      return "10xx: Change waveform";
-      break;
-    case 0x11:
-      return "11xx: Toggle noise mode";
-      break;
     case 0x12:
-      return "12xx: Setup LFO (0: disabled; 1: 1x depth; 2: 16x depth; 3: 256x depth)";
-      break;
-    case 0x13:
-      return "13xx: Set LFO speed";
+      return "12xx: Set pulse width";
       break;
     case 0x17:
-      return "17xx: Toggle PCM mode";
+      return "17xx: Trigger overlay drum";
       break;
   }
   return NULL;