By Mark Savage, BBC News
Shirlena Johnson is one of the X Factor acts whose vocals were supposedly tweaked X Factor producers have been accused of enhancing contestants’ vocals to make them sound better – but what is “autotune” and how does it work? If you’ve ever removed red-eye from a photograph, or used a spell checker to correct an essay, then you know how computer software can… well, “enhance” your raw material. Autotune performs exactly the same function with music, by smoothing out sharp or flat notes to make singers pitch perfect.
http://www.bbc.co.uk/news/entertainment-arts-11056840
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