dig into the H9 control app.. there are options for assigning what the H9 does in response to all PC changes. Its called the PROGRAM CHANGE RECIEVE MAP.
Once you get familiar with that… if you are still having troubles, come tell us:
1) what PC messages you are sending..
2) what you want it to do.
But I think spending 30 minutes in the MIDI setting pages will clear it all up for you!