For the HX Stomp, I see that there is the following setting to auto-engage the wah block with an expression pedal: Bypass assign – Switch Types – FS1, FS2, FS3, EXP1, EXP2
You can then set the percentage of travel before engaging the wah as well at the delay time to engage.

I use an MAudio EX-P Expression Pedal that is plugged in to the EXP slot of a Tech 21 Midi Moose. The Expression pedal is controlling the wah on Midi CC 80.

You can see my dilemma... Switch Types – FS1, FS2, FS3, EXP1, EXP2  with NO OPTION FOR MIDI CC as the switch type?! Am I missing something? I love this unit. I would really like to get this working. I can't plug the MAudio pedal directly into the Exp 1 input of the HX Stomp as there is a compatibility issue getting a full travel to 0 percent. Matbe someone has a solution to that? Thanks in advance!!!

If there is no solution, maybe Line 6 could add Midi CCs to the Bypass Switch option menu in an update.