This looks like a really great project.

I naively thought that with 300ish synths covered they'd have everything I own but I can see that's not the case.

I've got Alesis, Casio and Yamaha equipment that's missing. Time to dig out the manuals and get a PR ready.

It's easy to forget how successful the MIDI standard is. It might be the most stable and still relevant digital standard of all time.

My oldest bit of kit is a Casio CZ-5000 from, I think, 1985. That I can plug it into the latest equipment without drivers and it still works is amazing. 5 pin DIN for the win!