Hi man! first of all, sorry for my english haha!
I had exactly the same problem and I did this;
in the hx, I put the min value in %100, and the max value in %0 (Im talking about the wah wah pedal).
after that you have to check the expresion pedal knob (if you have one)
that worked for me BUT, now I have another problem, and the problem is that I dont like how the swell of the pedal works.