No singer is perfect, though some are more accurate than others. Auto-Chromatic Pitch Correction gently (or not so gently) guides your voice to the nearest “pure” note, making sure you always sound your best.
When performing with Pitch Correction, it’s normal to hear a slight “phasing” or “chorusing” effect. It’s the combination of your head voice and the corrected voice via your monitoring system. You’ll get used to the sound quickly and don’t worry; the crowd only hears the corrected voice.
Check out this Craig's Corner episode for more info: