akai mpc500 (and the others) claim to have '48 tracks' - but it's a completely different method, with each *pad* having its own sequencer track, irrespective of MIDI. it is completely confusing and messed up, if you're used to straightforward midi channel use. of course it just refers to a single midi note, and its course along the timeline.
i think our friend's issue has more to do with Cakewalk's handling of banksel+progch - am not using DAWs for this kind of thing -ha, so i'm not going there ! :P