So it seems I got my DOUT pins backwards. Pin 7 is connected to what should be pin 0, pin 6 is connected to what should be 1, etc. I think I'd like to try to modify the app to accomodate this, rather than try to modify my pcb. And so ... this would finally mark my first foray into the world of actual MIDIbox programming. I'd love it if somebody could suggest a place to start, or otherwise tell me it's a stupid idea (and that I should just fix the board)