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I'm pretty sure you're thinking of a vocoder, not auto-tune.

No he's thinking right. Vocoders usually sound a lot different. Kanye and T-Pain are using Auto-Tune.

To be fair, Kanye has also employed vocoders. See: "The New Workout Plan"

I could be wrong, but I believe that was a talkbox, not a vocoder.

In the style of Zapp & Roger.