diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 95b3229f1..2540f8133 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,13 +20,13 @@ jobs:
         config:
           - { name: 'Windows MSVC x86', os: windows-latest, compiler: msvc, arch: x86 }
           - { name: 'Windows MSVC x86_64', os: windows-latest, compiler: msvc, arch: x86_64 }
-          - { name: 'Windows MinGW x86', os: ubuntu-20.04, compiler: mingw, arch: x86 }
-          - { name: 'Windows MinGW x86_64', os: ubuntu-20.04, compiler: mingw, arch: x86_64 }
+          ##- { name: 'Windows MinGW x86', os: ubuntu-20.04, compiler: mingw, arch: x86 }
+          ##- { name: 'Windows MinGW x86_64', os: ubuntu-20.04, compiler: mingw, arch: x86_64 }
           - { name: 'macOS x86_64', os: macos-latest, arch: x86_64 }
           - { name: 'macOS ARM', os: macos-latest, arch: arm64 }
-          - { name: 'Linux x86_64', os: ubuntu-18.04, arch: x86_64 }
+          ##- { name: 'Linux x86_64', os: ubuntu-18.04, arch: x86_64 }
           #- { name: 'Linux ARM', os: ubuntu-18.04, arch: armhf }
-      fail-fast: true
+      fail-fast: false
 
     name: ${{ matrix.config.name }}
     runs-on: ${{ matrix.config.os }}
diff --git a/src/engine/platform/arcade.cpp b/src/engine/platform/arcade.cpp
index f9a2e7cb7..1984e5a18 100644
--- a/src/engine/platform/arcade.cpp
+++ b/src/engine/platform/arcade.cpp
@@ -19,6 +19,7 @@
 
 #include "arcade.h"
 #include "../engine.h"
+#include "../../ta-log.h"
 #include <string.h>
 #include <math.h>
 
@@ -868,17 +869,18 @@ void DivPlatformArcade::setFlags(const DivConfig& flags) {
   switch (flags.getInt("clockSel",0)) {
     case 1:
       chipClock=COLOR_PAL*4.0/5.0;
-      baseFreqOff=12;
       break;
     case 2:
       chipClock=4000000.0;
-      baseFreqOff=-122;
       break;
     default:
       chipClock=COLOR_NTSC;
-      baseFreqOff=0;
       break;
   }
+  CHECK_CUSTOM_CLOCK;
+
+  baseFreqOff=round(768.0*(log((COLOR_NTSC/(double)chipClock))/log(2.0)));
+
   rate=chipClock/64;
   for (int i=0; i<8; i++) {
     oscBuf[i]->rate=rate;
diff --git a/src/engine/platform/ay8930.cpp b/src/engine/platform/ay8930.cpp
index fb2584c98..50b36a64f 100644
--- a/src/engine/platform/ay8930.cpp
+++ b/src/engine/platform/ay8930.cpp
@@ -809,6 +809,12 @@ void DivPlatformAY8930::setFlags(const DivConfig& flags) {
     case 12:
       chipClock=3600000;
       break;
+    case 13:
+      chipClock=20000000/16;
+      break;
+    case 14:
+      chipClock=1536000;
+      break;
     default:
       chipClock=COLOR_NTSC/2.0;
       break;
diff --git a/src/engine/platform/bubsyswsg.cpp b/src/engine/platform/bubsyswsg.cpp
index 318697223..d7b15d8ff 100644
--- a/src/engine/platform/bubsyswsg.cpp
+++ b/src/engine/platform/bubsyswsg.cpp
@@ -68,7 +68,7 @@ void DivPlatformBubSysWSG::acquire(short** buf, size_t len) {
     if (out>32767) out=32767;
 
     //printf("out: %d\n",out);
-    buf[0][h]=buf[1][h]=out;
+    buf[0][h]=out;
   }
 }
 
diff --git a/src/engine/platform/n163.cpp b/src/engine/platform/n163.cpp
index 7f337e980..a65532793 100644
--- a/src/engine/platform/n163.cpp
+++ b/src/engine/platform/n163.cpp
@@ -114,7 +114,7 @@ void DivPlatformN163::acquire(short** buf, size_t len) {
     int out=(n163.out()<<6)*2; // scale to 16 bit
     if (out>32767) out=32767;
     if (out<-32768) out=-32768;
-    buf[0][i]=buf[1][i]=out;
+    buf[0][i]=out;
 
     if (n163.voice_cycle()==0x78) for (int i=0; i<8; i++) {
       oscBuf[i]->data[oscBuf[i]->needle++]=n163.voice_out(i)<<7;
diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index 51f858519..4e798c6e5 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -343,7 +343,7 @@ void DivPlatformOPL::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,-131071,131071);
       } else {
         chan[i].pitch2=chan[i].std.pitch.val;
       }
diff --git a/src/engine/platform/opll.cpp b/src/engine/platform/opll.cpp
index 3556679ef..cba125c15 100644
--- a/src/engine/platform/opll.cpp
+++ b/src/engine/platform/opll.cpp
@@ -124,7 +124,7 @@ void DivPlatformOPLL::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;
       }
diff --git a/src/engine/platform/t6w28.cpp b/src/engine/platform/t6w28.cpp
index 4f42d076c..e81d156f1 100644
--- a/src/engine/platform/t6w28.cpp
+++ b/src/engine/platform/t6w28.cpp
@@ -289,6 +289,7 @@ void DivPlatformT6W28::forceIns() {
     chan[i].insChanged=true;
     chan[i].freqChanged=true;
   }
+  rWrite(1,0xe0+chan[3].duty);
 }
 
 void* DivPlatformT6W28::getChanState(int ch) {
diff --git a/src/engine/platform/tx81z.cpp b/src/engine/platform/tx81z.cpp
index 2b119abbe..fa3d4d18a 100644
--- a/src/engine/platform/tx81z.cpp
+++ b/src/engine/platform/tx81z.cpp
@@ -941,14 +941,15 @@ void DivPlatformTX81Z::setFlags(const DivConfig& flags) {
   int clockSel=flags.getInt("clockSel",0);
   if (clockSel==2) {
     chipClock=4000000.0;
-    baseFreqOff=-122;
   } else if (clockSel==1) {
     chipClock=COLOR_PAL*4.0/5.0;
-    baseFreqOff=12;
   } else {
     chipClock=COLOR_NTSC;
-    baseFreqOff=0;
   }
+  CHECK_CUSTOM_CLOCK;
+
+  baseFreqOff=round(768.0*(log((COLOR_NTSC/(double)chipClock))/log(2.0)));
+
   rate=chipClock/64;
   for (int i=0; i<8; i++) {
     oscBuf[i]->rate=rate;
diff --git a/src/engine/platform/vrc6.cpp b/src/engine/platform/vrc6.cpp
index 9b4c49f03..f798d6e8d 100644
--- a/src/engine/platform/vrc6.cpp
+++ b/src/engine/platform/vrc6.cpp
@@ -81,7 +81,7 @@ void DivPlatformVRC6::acquire(short** buf, size_t len) {
     int sample=vrc6.out()<<9; // scale to 16 bit
     if (sample>32767) sample=32767;
     if (sample<-32768) sample=-32768;
-    buf[0][i]=buf[1][i]=sample;
+    buf[0][i]=sample;
 
     // Oscilloscope buffer part
     if (++writeOscBuf>=32) {
diff --git a/src/log.cpp b/src/log.cpp
index 1611e688f..8fec13189 100644
--- a/src/log.cpp
+++ b/src/log.cpp
@@ -29,13 +29,14 @@ int logLevel=LOGLEVEL_INFO;
 
 FILE* logFile;
 char* logFileBuf;
+char* logFileWriteBuf;
 unsigned int logFilePosI;
 unsigned int logFilePosO;
 std::thread* logFileThread;
 std::mutex logFileLock;
 std::mutex logFileLockI;
 std::condition_variable logFileNotify;
-bool logFileAvail=false;
+std::atomic<bool> logFileAvail(false);
 
 std::atomic<unsigned short> logPosition;
 
@@ -157,8 +158,8 @@ void _logFileThread() {
       }
     } else {
       // wait
-      if (!logFileAvail) break;
       fflush(logFile);
+      if (!logFileAvail) break;
       logFileNotify.wait(lock);
     }
   }
@@ -177,6 +178,7 @@ bool startLogFile(const char* path) {
   }
 
   logFileBuf=new char[TA_LOGFILE_BUF_SIZE];
+  logFileWriteBuf=new char[TA_LOGFILE_BUF_SIZE];
   logFilePosI=0;
   logFilePosO=0;
   logFileAvail=true;