Create a new empty project, add a single player with unpitched perucussion. I am going to use hi-hat as an example.
Go to write mode, select keyboard, play F#2 - it will trigger HH. Play other keys and you will hear general midi percussion, no surprise there. Now go to piano roll editor and draw a note anyhwere - notice whatever note you draw, it sounds like HH. Ummm… that’s odd?
Now go to edit mode and select pads, create a couple of notes. Go to piano roll - they are B4 notes. Why??? If you play B4 on the keyboard, it’s certainly not HH sound.
However, play your creation, and you will hear HH.
Unless of course you chose AU3 other than Microsonic. Then all falls apart.
Add another player with Kick drum, observe the notes are also recorded as B4. And worse, use open HH or pedal - all are B4
Why is Dorico not using GM notes for unpitched percussion?? This makes it impossible to use any 3rd party instruments. Seems like such an odd bug.
Edit: hmm… there seems to be more magic behind the scenes. Exported midi is ok and even GM playback works in another project. Maybe magic just got corrupted on the project i was working on?
Edit2: indeed, on the corrupted project midi is exported as B4!