Mmm, got it. The MPK has no MIDI cable output - you'd have to run it through a computer first to get it into a volca. Currently looking for a keyboard to play my Keys with too, hope one of us can find a decent one!
Holy crap. I didn't realize the Akai was midi-free. I just assumed it had it. It seems that one of the major obstacles for myself when looking at controllers is that they're mainly oriented around computer/ableton live hookup.