Method PitchToFreq

Source/Scale.cpp:174–252

}

float Scale::PitchToFreq(float pitch)
{
   if (mIntonation == kIntonation_SclFile)
   {
      auto ip = (int)pitch + 128;
      if (ip < 0 || ip > 256)
         return 440;

      // Interpolate in log space
      auto lt = mTuningTable[ip];
      auto nt = mTuningTable[ip + ((ip != 255) ? 1 : 0)];
      auto fp = (pitch + 128) - ip;
      auto interplt = (1 - fp) * lt + fp * nt;

      // Then pow2 it and multiply by freq0
      return Pow2(interplt) * Tunings::MIDI_0_FREQ;
   }

   if (mIntonation == kIntonation_Oddsound)
   {
      if (mOddsoundMTSClient && MTS_HasMaster(mOddsoundMTSClient))
      {
         if (pitch < 0 || pitch > 127)
            return Pow2((pitch - mReferencePitch) / mPitchesPerOctave) * mReferenceFreq; // Improve this obviously
         else
            return MTS_NoteToFrequency(mOddsoundMTSClient, (int)pitch, 0);
      }
      else
      {
         return Pow2((pitch - mReferencePitch) / mPitchesPerOctave) * mReferenceFreq;
      }
   }

   switch (mIntonation)
   {
      case kIntonation_Equal:
         return Pow2((pitch - mReferencePitch) / mPitchesPerOctave) * mReferenceFreq;
      /*case kIntonation_Rational:
      {
         int referencePitch = ScaleRoot();
         do
         {
            referencePitch += mPitchesPerOctave;
         }while (referencePitch < mReferencePitch && abs(referencePitch - mReferencePitch) > mPitchesPerOctave);
         float referenceFreq = Pow2((referencePitch-mReferencePitch)/mPitchesPerOctave)*mReferenceFreq;
         
         int intPitch = (int)pitch;
         float remainder = pitch - intPitch;
         float ratio1 = RationalizeNumber(Pow2(float(intPitch-referencePitch)/mPitchesPerOctave));
         float ratio2 = RationalizeNumber(Pow2(float((intPitch+1)-referencePitch)/mPitchesPerOctave));
         return ofLerp(ratio1,ratio2,remainder)*referenceFreq;
      }*/
      case kIntonation_Pythagorean:
      case kIntonation_Just:
      case kIntonation_Rational:
      case kIntonation_Meantone:
      {
         int referencePitch = ScaleRoot();