Can you explain the merits of the MPC? Is it just that it offers a more hands-on feel, or is there more to it than that?
But the main one is that it forces you to compose with your ears, not your eyes.
The beatmaking process basically goes like this: you start the sequencer running and get a metronome output. You hit pads with different sounds assigned to them, and the sequencer grabs the hits and quantises them. If you listen back to it and don't like what you did, you can scrub it off without stopping the sequencer by holding Delete down with the pad you hit to input the sound originally. What this means in practice is that the loop goes round and round, and you chuck different stuff in and out, seeing what works.