You can, of course, connect any ALSA sequencer client/ports as you want. In fact, ALSA-seq connections predates JACK-MIDI by many years in QjackCtl implementation ;)
However, whether the connection does not persist or shows in the ALSA Connections tab window is odd.
Check your current Patchbay profile, maybe there's some rule re. Yamaha USB MIDI and/or ZynAddSubFX marked with the exclusive bit?
You can, of course, connect any ALSA sequencer client/ports as you want. In fact, ALSA-seq connections predates JACK-MIDI by many years in QjackCtl implementation ;)
However, whether the connection does not persist or shows in the ALSA Connections tab window is odd.
Check your current Patchbay profile, maybe there's some rule re. Yamaha USB MIDI and/or ZynAddSubFX marked with the exclusive bit?
Cheers