not sure if it has been said already but for a phone app for a dj my opinion is that it would be more realistic just to create a single track dj/mp3 player with simple (?) pitch control & eq.& hot cue points. not worrying about mixing or beat syncing.

EQ wise a simple silder function will suffice - no knobs here

that means any track i have on phone i can at least play/mix into a dj set.
as much as i lone my n900 i am realistic. I know what i want to do on vinyl/cd etc and my n900 aint up to doing it all at once (and I wouldnt want it to!)

anyone agree??