Const PITCH_STANDARD
Type
{pitchClass: PitchClasstype PitchClassPitchClass,
octave: Octavetype OctaveOctave,
midi: number,
frequency: number
}octave: Octavetype OctaveOctave,
midi: number,
frequency: number
Content
{ pitchClass: 'A', octave: 4, midi: 69, frequency: 440 }