I like to correct my statements above. Im currently able to do exactly that, ie drive the op-1 from the mpc-one fine, by using a external powered USB hub, and normal MIDI-IO on the MPC what is currently master clock, i use a cheap presonus audiobox USB audio IO as main interface, this setup seems to be solid, im well impressed by the MPC in terms of functionality / capabilities , it seems to have the potential to replace a DAW ie ableton.