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Vari-speed

From Chace Audio

Vari-speeding sound allows an audio engineer to deviate from (or to) a standard speed. It is the process of changing the speed of an audio track to match the speed of another audio track or video source.

Vari-speeding is often used to correct speed variations due to rate conversion or nonstandard playback speeds. If a track's speed is changed enough, it is possible to hear a pitch difference. For example, a 4% change, which is the difference between 24 frame (FILM speed) and 25 frame (PAL video speed), is one semitone (or half step) in pitch.