Thanks for the reply, korakios! I appreciate the suggestions. Unfortunately, the input controls have a malfunction and none are working. I’m really stuck until I can learn more about how the circuit board is designed. I would give my lunch money for a schematic or diagram of the circuit logic. I’ve thought about jumping the buttons to the main board just to see if it’s the control board/harness that’s bad, but I’m brand new to the Alesis brand, don’t wanna do more harm. The unit is upgraded to the 2.0 EPROM, and apparently it worked when it left the seller, which I believe after contacting him, so something could have happened in shipping. I’m so bummed. I’m not completely useless with electronic repair, but I’m no expert either. It’s just sitting there waiting to be used, and I’m not confident about digging into it yet. Ugh...