It's not Auto-Tune, and I've been trying to figure out what type of unit will create that type effect for a live performance... It's makes the voice sound as if it's going through a flanger+autotune filter. Here's a video that shows how it really exactly sounds. http://www.youtube.com/watch?v=26mbsj1crao , the artist sings his voice through the effect at about 35 seconds.