"If you could control your music with all of your digits, and get interactive feedback on a display, what would your setup look like? Expert Lemur user and software engineer Bryant Place has one such answer. It shows off just how much the Lemur’s software has evolved over a series of revisions, and reveals a bit of what can go into performing with Ableton Live."
This looks really cool. I won't go into too much detail here because Create Digital Music did such a great job with their article. CHECK IT OUT!
http://createdigitalmusic.com/
http://www.ableton.com/
LEMUR