I did that but discovered I need to discionnect from the app before the midi controller will work. I swore it was working before. Is this normal? I removed the USB cable and suddenly the programs change with the foot pedal again.
Yes, it's always worked this way. The USB and MIDI jacks are connected to a single physical thing, and so, you can't use both at the same time. You can connect to the H9 via Bluetooth though and use MIDI at the same time.