External Expression pedal - doesn't seem to be recognized

[chromecity]

Hi folks.  Totaly newbie at this (like many I'd presume, being as it's so new).  I've tried plugging my expression pedal into both of the available expression pedal jacks and powering on the unit.  Then selecting a wah and setting the controller to be the corresponding one for whichever jack I'd plugged into.  No luck with either jack - nothing appears to be detected about my expression pedal.  It works fine with my Moog Minifooger OD pedal, so it's not just a defective expression pedal.  And it claims that it's a generic expression pedal that will work with pretty much anything:

http://www.musiciansfriend.com/accessories/moog-ep-3-universal-expression-pedal

Is there some sort of configuration I need to do that I have overlooked?

Thanks in advance for any assistance!
 

[phil_m]

Try using it with a regular mono guitar cable (a TS cable) instead of the TRS cable it came with.

[chromecity]

Thanks for the suggestion, Phil.  I tried it and didn't get any different results.  Eventually, it got to a point where it would work with the original cable.  What I needed to do was set the switch under the pedal to "Other" (from "Standard"), and power down the Helix and let it power back on with the pedal in that state.  Then it worked (of course, backwards, just like everybody else's 3rd-party expression pedals have been reported to do).  So I'm in business now.  Thanks for the assist!