You’ll need to figure out exactly what messages you are sending from your MIDI controller and setup the H90 accordingly.

You must use PC messages to load specific Programs on the H90, example: send PC 10 to load Program 10.

You can use CC messages to go up and down the Program List, or Load a Program that you’ve queued up. Similarly, you can go up and down by Banks.

The full list of MIDI mapping options can be found here: https://cdn.eventideaudio.com/manuals/h90/1.7.1/content/appendix/global.html