I had a plan for gameboy-based workstation like the mpc, mainly a midi sequencer with different tracks. In first place it should only transfer midi in and out, sound output isn't so important. since my new flatmate is electronic IT guy, it shouldn't be too hard to programm the hardware side would be nearly the same as the arduinoboy.
Guys, let's write a new tracker just in honor of this analogy, and call it BYOT:
Bring Your Own Tracker.
but yeah more Advance things tracker or otherwise would be good for a change from DMG