X Factor bosses have admitted using computers to tweak the singing of some contestants when putting together the audition programmes.
It means voices you hear on your TV at home could sound slightly different to what the judges heard at the audition.
An X Factor spokesperson said it's a usual part of the editing process and that judges base their decision on what they hear live on the day.
But some fans went online after Saturday's show to say they were angry.
One viewer said of 18-year-old Gamu Nhengu's performance: "Cannot believe they autotuned her, listen to the words 'door' and 'telephone' and it's very clear."
A spokesperson for The X Factor wouldn't go into detail but said: "The footage and sound is then edited and dubbed into a finished programme, to deliver the most entertaining experience possible for viewers."
Computer helps Leah to sing
She added that this wouldn't happen during the live shows, when everything you hear at home will be the same as in the studio.
Saturday's opening episode pulled in 11.1 million viewers - the highest ever for a first episode of the reality series.
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