Hey Ben,
The PitchFlex algorithm should automatically be mapped to the expression pedal on the H9. You'll see HEEL and TOE parameter knobs in the interface which set the pitch shift amounts for those positions on an expression pedal.
Are you not hearing any pitch shift with any of the Factory Presets? What happens when you press the FLEX button in Control or use an AUX switch?
By design, all of the "standard" 10 knob parameters CANNOT be mapped to expression in this algorithm.
