code: function fromMidi (midi) {
    var name = CHROMATIC[midi % 12]
    var oct = Math.floor(midi / 12) - 1
    return name + oct
  }
docs: Get the pitch of the given midi number
  
  This method doesn't take into account diatonic spelling. Always the same
  pitch class is given to the same midi number.
  
  @param {Integer} midi - the midi number
  @return {String} the pitch
  
  @example
  pitch.fromMidi(69) // => 'A4'