Hello ed536m,
If you are new to MIDI it may help to understand some basics, so I recommend this video: https://youtu.be/JIzCEYvwt1M?feature=shared
Once you understand the difference between a Program Change message (PC) and Controller Change message (CC) you can watch the H90 MIDI tutorial; go to 8:38.
https://youtu.be/tfd3wQHzxcA?si=Rofol-xIQ12dxOdM
