BUMP
I know this is a super old post but i have had the exact issue for a while now. Ive gone through the docs and followed all the steps.
My keyboard works and i can see the notes in PU1 but no sound/noise or anything.
The only way to get sound is to fill the chain with blank notes (like ceafin mentioned), but then its not really live and the sound is locked to the blank notes filled into the pulse channel.
Ive seen a few dudes on youtube jamming live with theirs but cant get the same to work.