Alright, I watched a video on YouTube, it was guttermouth recording at the studio. Their singer talked into an "ossilator" (spelling) I have no idea what it is, but all he did was speak into it, it changed his voice into the key of the song and that was all he had to do. Can someone please explain to me how this works?

Heres the video: http://youtube.com/watch?v=LPntW2NQbwk&search=Guttermouth
dude that was a joke. and im pretty sure they were all stoned. lol u didnt know the way they were laughing and saying the fan was what did it.