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Thank you!

I was using my Yamaha keyboard with Ubuntu 16.04 and musecore, and when I upgraded to 20.04 (which required a drive wipe and reinstall) all this stopped working. It took this post to get it back.

For the record: I did this entirely within qjackctl, where the key was Setup/Settings/MIDI Driver='seq'. This set up the bridged MIDI devices in the midi panel. When I start Musescore, musescore also shows up only in the MIDI panel.

I can then use qjackctl to connect the midi pass through devices in the ALSA panel to the digital piano devices in the ALSA panel, AND connect the musescore devices to the associated bridge devices in the MIDI panel. Now musescore can play scores on my digital piano, and I can use the piano as an input device to musescore.

It took a little fiddling to get right, but the real showstopper had been that "driver=seq".