Ok so this is my ultimate dream realized: SNES, genesis, and game boy sound systems all being performed live, through midi, from one source. I love this *soooo* much.
It's still a mess for now, eventually the goal is to have a custom pcb made, that each chip (or sound system in the case of SNES, and main board in the case of game boy) connects to, all in a nice compact housing.
Still debating on the lil screen, it'll probably just be passive, displaying incoming notes and what system they're assigned to. I've decided (at least for this version) to keep the "controls" in the computer, as having it be fully stand-alone just isn't feasible atm.