Now we're talkin'!10 channel Frog-Brain, that's my suggestion. I'd buy it.
Best have the auto-tune allow parameter visibility and tweaking.
Then no 400 page threads on "I ran auto-tune and I can't get this.." or "I can't get that.." or "it doesn't blend this.." The reply would be singular and easy.. "Then go in and change it!"
And don't let on until it's on the shelves or there will be 200 pages of "when's it coming out?"