High Quality Content by WIKIPEDIA articles! Auto-Tune is a proprietaryaudio processor created by Antares Audio Technologies. Auto-Tune uses a phase vocoder to correct pitch in vocal and instrumental performances. It is used to disguise off-key inaccuracies and mistakes, and has allowed singers to perform apparently perfectly tuned vocal tracks without needing to sing in tune. While its main purpose is to slightly blend sung pitches to the nearest true semitone (to the exact pitch of the nearest tone in traditional equal temperament), Auto-Tune can be used as an effect to distort the human voice when pitch is raised or lowered significantly. The overall effect to the discerning ear can be described as hearing, for example, the voice leap from note to note stepwise, like a synthesizer.