I have a friend who runs a Pro Tools-based semi-pro studio in his basement (and just about had to take out a second mortgage to pay for it!), and he showed me some plugins that handle note tuning. He played me an example with a singer unprocessed and then processed. It was pretty neat, to say the least, but I have to say that the end result sounded over-processed to my ears. It can make a mediocre singer sound good, that's for sure! I'm not sure I would use it for something like a guitar, though, where subtle nuances in fingering could be ruined by trying to tune microtonic bends. -- Brett