I’ve tried Auto-Tune with Renoise several times, but never gotten it to work properly.
Are there any Renoise users out there who’ve had a successful session with Auto-Tune?
(tried to find a singing smiley… this have to do for now) 
What does not work properly?
What auto-tune? Are you talking about some plugin or what exactly?
That’s funny, because a google search returns approx. 3 million hits. Auto-tune is a phenomenon, no less.
@dufey: if it works like most vocoder-style plugins do, you need to insert it as an VST instrument alias for it to be able to receive notes?