Ok, I found this:

https://www.pgmusic.com/tutorial_bbm_nosound.htm#basic

"simply go to MIDI | Select MIDI Driver... and select "Apple DLS Synth".

I can't find this anywhere. The doc is from 2018.


iMac 2018, Catalina 10.15.1 BiaB 2019 64-bit
MacOS 11.3.1 Big Sur Mac Mini