'No autotune' on American Idol
American Idol producers have claimed never to have used auto-tune.
Responding to the furore over the use of the pitch-correction software on The X Factor, the American show's producers said: "We have never, nor would we ever, use auto-tuning during the American Idol competition."
X Factor judge Simon Cowell left American Idol after the last series, and no announcement has been made about his replacement.
Neither has a replacement been announced for fellow departing judge Ellen DeGeneres.
American Idol returns in January, while Simon is bringing an American version of The X Factor to the US network Fox next year.