README
Use
Converts a MIDI pitch to a frequency or a frequency to a MIDI pitch.
ptf = require('pitch-to-frequency')
ptf.frequencyToPitch(440)
// { pitchClass: 'A', octave: 4, cents: 0 }
ptf.pitchToFrequency({ pitchClass: 'A', octave: 4, cents: 0 })
// 440