No, but there’s a radical fix/improvement about MIDI (or a series of them) that I may have been waiting for: MIDI: your experiences and the state of support in Rack
I’ve had enough problems with the combo Rack+MIDI+Linux+“an old computer”. Mostly about MIDI sync with external synths, rather than MIDI controllers - but I couldn’t figure out what the exact issues were, so I think it makes sense for me to wait until Rack offers a better support and see how my system behaves.