Yeah, I know it's a custom part. I was wanting to see if it was the same part used in the MX-70. A couple of the cards in my MX-70 have the older drivers and I think one of them may be going bad (hearing a crackling sound for several minutes when I first turn the machine on and occasionally after that, relays have already been replaced with Omrons). I was hoping that since the MX-80 is so similar to the MX-70, that they might have the same output driver. If that's the case, I could just buy a used card from an MX-80, which are fairly easy to find, and swap the drivers. Otari says they can sell me the driver for an MX-70, but I could buy 5 or 6 used MX-80 cards for less that what they quoted me for 1 driver. Plus, it will take Otari 2-3 months to ship the part.