Finally they got it working. When I got the board back, reassembled and powered up, I checked the firmware. It's now at 2.3, which is odd because the most up-to-date version on their website is 2.2. I called to ask what happened. Turns out they had one of their wizards actually write an OS update just for my synth, to fix the issue with the pot board. How f'n cool is that? What hardware company would go this far out of their way to support a 10 year old synth that's no longer in production? I want to send these guys a fruit basket.