Oh KADE firmware, you are the bees knees, the pinnacle of awesomeness, etc....
The keyboard hack I had in my jukebox to run the ESC button and the Coinup has been acting wonky, so last night I ripped it out and got one of the AVRs I had on hand. I fired up the software, programmed it so that A01 was Keypress 5, A02 was ESC, wired it up, made a hole in the plastic cover that Xconsoles shipped with them, ran the wires through, spliced it into the existing jukebox wiring, and started it up... perfection. Thanks, KADE Team!