^^ hehe, dude i think what you're saying is so 'complex' that even
you don't know what you're talking about. i sure as hell don't.

nice try though...
this can definitely be done, you just need a trigger-midi interface of some sort. the ION uses one of these itself, a small unit which has inputs for the drum pads and sends out a midi signal to the drum machine that comes with it (a re-badged Alesis SR-16). you could probably just replace the ION drum machine with the MPC itself. looks like it
might fit on the stand there. simply changing the note numbers on an MPC program set up for this would be just the way to do it. if the pad velocity gets converted to midi velocity (which is usually the case) then you could take advantage of the velocity>volume/start/decay settings on the MPC. not sure how the build quality is, but the ION should work out good for the price. here's some other examples (you can buy sets of two ION pads for $50 and build your own set if you didn't need the whole thing)...
Alesis DM5 (or 4 or whatever, they all work the same)
Roland TMC6
Roland PM-16 (16 pad inputs!)
