I've been waiting for a app like this for ages. Only one problem what happens if your showwing off at a party then the phone rings??? Joke.

But seriously I don't think that the device would be able to keep up with the pitch, fx, playing 2 tracks at once. Esspecial if they were to be 320kbps mps you were doing at the time.

The only on way this would be pratical if you could actually lock down the device when the app is loaded, disable un needed processes along with in coming calls. Even better have a option to force the phone to go into offline mode basicaly. I run my bad boy @ 1GHZ so I think I could possible get away with is but dont forget the basic coding for the processor is locked @ 500dsp ( I think anyway, unless some one has got around this already? :s )

For the Idea 9/10 so my device will be up for testing. It would be interesting to see how I get on with it, I used to use timecodes with my old cd mixers, not I got usb ones though. I'd be able to play at a house party and plan the mix or practice on the way there. Not that I don't pay full atention to the road 8-)
Nore my typing by the looks of it. So I shal leave you that, actually screw it. 10/10 I'd like this project to come alive.