Antares Auto-Tune EFX+It includes professional quality Auto Tune pitch correction with low latency processing for real time performance on stage or in the studio. Fully adjustable Retune Speed and Humanize parameters let you fine tune the desired effect for your tracks, from transparent pitch correction to the iconic Auto Tune Effect. And compatibility with Auto Key (sold separately) means never having to worry about finding the key of your music before tuning. Auto Key