> I see MorphOS now has built in USB midi and audio support. I have a few usb keyboards
> and 5 USB audio interfaces here I can test out. 3 Tascam, 1 Focusrite and 1 Presonus

There's a dedicated thread where you could report your findings with regard to compatibility with those devices:

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=12&topic_id=12288&start=54