*Augmented octave and diminished unison on C = C♯. Equal-tempered: 21/12:1 = 100 cents. MIDI pitch bend: none Note how the diminished unison is essentially equivalent to the augmented unison.
A sound file playing the interval of an augmented fifth, in equal temperment. The first tone is a sine wave at 300 Hz, the second is at 476.1 Hz, the last is the interval. Made with NCH Tone generator.