IIRC, the PM2K modules are better sounding and easier to modify than the PM1K's. I had a ton (40) of the PM3K modules, but decided it was to much of a pain in the ass to modify them, so I sold the board as a whole. If you need more of the PM1K modules, I think I know where to get a bunch of them. An old friend has had one in this garage for many many years now, and I'm willing to bet that he'd part it out. You might as on GearSlutz as those guys tend to be more of the studio types. Also, I know I have seen these modules sold as rack mount pieces on eBay, so you might want to look on there for ideas.