History
Pitch correction was relatively uncommon before 1997, when Antares Audio Technology's Auto-Tune Pitch Correcting Plug-In was introduced. This replaced slow studio techniques with a real-time process that could also be used in live performance.
Auto-Tune is still widely used, as are other pitch-correction algorithms including Celemony's Direct Note Access which allows adjustment of individual notes in a polyphonic audio signal, and Celemony's Melodyne. Pitch correction is now a common feature in digital audio editing software, having first appeared as a Pro Tools plugin and now being found in products such as Apple GarageBand, Apple Logic Pro, Adobe Audition, FL Studio & Steinberg Cubase. It is also available in the form of rackmount hardware, such as the TC-Helicon VoiceOne. A free VST plugin known as GSnap can also be used to get the same effect. In the Linux FOSS community, Autotalent and Zita-AT1 offer this functionality.
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