Dunlop Expression Pedal 0-100-0 sweep in Helix Posted March 15, 2019 12 hours ago, danielygo said: Hi, I am using a Dunlop DVP4 Mini X as my expression pedal with my HX Effects. I was experiencing the same problem as you did until I reversed the polarity of the expression pedal input via the Global Settings in my HX Effects. I am using a regular TS cable and the DVP4 is inserted into the expression pedal input #2 (functions as a volume pedal). After reversing the polarity on the Global Setting, everything is working as it should. Hope this helps. my man. Thank you.