There seems to be not really an established standard for TRS pedal wiring.
Your pedal shoud be connected via TRS, T (tip = pedel position in) should be connected to the pedal slider, R (ring = 5V out) to the hot end of the pedal poti, S is ground… and the pedal should deliver 0V if open, nearly 5V (ring voltage) if fully pressed.
I got a M-Audio pedal that has a switch on the button with the positions “M-AUDIO <-> OTHER”.
This works only correct in the M-AUDIO position (in OTHER T & R of the TRS-connector are interchanged).
And my pedal has another poti on the side to adjust the out voltage if fully open … has to be in minimum position to work best.
Hope this helps.
This has a POLARITY switch and a MIN VOL knob with exactly the same functionality.
Just connect it with a TRS-cable to the Super6 (using the EXP connector of the pedal), put the MIN VOL knob to minimum and then try in which position of POLARITY it works.