Thanks very much for the info. It works, but unfortunately does not work very well with my rig Perhaps my expression pedal does not match up well with the H9? I have the Boss EV-30.
You can calibrate your expression pedal in Pedal Settings -> General Settings -> Pedal Calibration Disable, and switch that to NO, move your expression pedal and then switch to YES. If the ribbon in the UI moves from the min to max with your pedal, it means it's set up correctly.