Function FreqToMIDInote

libraries/lib-math/PitchName.cpp:23–27

#include <math.h>

double FreqToMIDInote(const double freq)
{
   // Make the calculation relative to A440 (A4), note number 69.
   return (69.0 + (12.0 * (log(freq / 440.0) / log(2.0))));
}

double MIDInoteToFreq(const double dMIDInote)
{