Instead of Autotune, try Melodyne. You can control not only the pictch, but also, volume, timing, vibrato (in a more detailed way than in Autotune) and several other features. Melodyne is probably the most powerful pitch correction software available. Of course, it also costs around $800 I think.
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Gary Shepherd
Sierra Session D-10
www.16tracks.com
Antares Auto-Tune 4
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