diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ffe48ee1..149d234c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,7 +11,7 @@ defaults:
     shell: bash
 
 env:
-  BUILD_TYPE: Debug
+  BUILD_TYPE: Release
 
 jobs:
   build:
diff --git a/src/engine/platform/sms.cpp b/src/engine/platform/sms.cpp
index 16a7c501..1d51f56b 100644
--- a/src/engine/platform/sms.cpp
+++ b/src/engine/platform/sms.cpp
@@ -127,7 +127,7 @@ double DivPlatformSMS::NOTE_SN(int ch, int note) {
   }
   int easyStartingPeriod=16;
   //int easyThreshold=round(CHIP_CLOCK/(parent->song.tuning*0.0625*pow(2.0,(float)(nbase+384)/(128.0*12.0)))/CHIP_DIVIDER);
-  int easyThreshold=round(log((CHIP_CLOCK/(easyStartingPeriod*CHIP_DIVIDER))/parent->song.tuning)/log(2.0));
+  int easyThreshold=round(log((chipClock/(easyStartingPeriod*CHIP_DIVIDER))/parent->song.tuning)/log(2.0));
   if (note>easyThreshold) {
     return MAX(0,easyStartingPeriod-(note-easyThreshold));
   }
@@ -135,13 +135,16 @@ double DivPlatformSMS::NOTE_SN(int ch, int note) {
 }
 
 int DivPlatformSMS::snCalcFreq(int ch) {
-  int easyThreshold=round(128.0*log((CHIP_CLOCK/(easyStartingPeriod*CHIP_DIVIDER))/parent->song.tuning)/log(2.0));
+  double CHIP_DIVIDER=toneDivider;
+  if (ch==3) CHIP_DIVIDER=noiseDivider;
+  int easyStartingPeriod=16;
+  int easyThreshold=round(128.0*log((chipClock/(easyStartingPeriod*CHIP_DIVIDER))/parent->song.tuning)/log(2.0));
   if (parent->song.linearPitch==2 && easyNoise && chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2>(easyThreshold)) {
     int ret=(((easyStartingPeriod<<7))-(chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2-(easyThreshold)))>>7;
     if (ret<0) ret=0;
     return ret;
   }
-  return parent->calcFreq(chan[ch].baseFreq,chan[ch].pitch,true,0,chan[ch].pitch2,chipClock,ch==3?noiseDivider:toneDivider);
+  return parent->calcFreq(chan[ch].baseFreq,chan[ch].pitch,true,0,chan[ch].pitch2,chipClock,CHIP_DIVIDER);
 }
 
 void DivPlatformSMS::tick(bool sysTick) {