A while ago I've made a linux driver for my old Steinberg MIDEX 8. I've used it ever since with Bitwig and Renoise, without a problem. Therefore, I think its time to let other people try the driver (if there are still any linux users with a midex8 ...).
I'm not planning to actively support it (other than for my own use), but feel free to contribute
See https://github.com/sgorpi/midex8 (https://github.com/sgorpi/midex8)