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"auto-calibration" doesn't work at all. I read somewhere that manual calibration was removed at some point early in the firmware lifecycle, a glaring mistake in my opinion. The Helix doesn't give me consistent EXP operation. I have four pedals: Roland EV5, Yamaha EP1, Ensoniq CVP1 and EHX Next Step EXP â€”none of them work, all of them are inconsistent. The Roland only covered a span of 50% at the full heel to toe range. the Yamaha goes from 0% to 100% to 11%, the Ensoniq goes from 0 to 100% to 0% in a single sweep. I went and researched how these pots work to try and hypothesise why the Helix glitched with TRS pedals of varied brands. I own a BOSS GT8 and it simply works with all of them. What bothers me the most is that the Ensoniq and Yamaha did work properly on the HD500X. One of the reasons I upgraded to the Helix was the possibility of using two external expression pedals, hence the disappointment when they didn't work. The EHX EXP pedal I mentioned didn't work with either the Pod or Helix. EDIT: I avoided expensive and heavy iron cast pedals like the Mission Engineering EP1, or the Ernie Ball that use a fragile cord to crank the pot. I purposely use plastic options because they are lightweight. EHX released a conventional passive expression pedal this past July and M-Audio sell the EX-P pedal which offers a linear and CW/CCW switch that make it compatible. scroll down for a practical solution to avoid modding to use on the Helix and fix the dreaded forward-backward glitch.