LarryVSmith Posted December 13, 2019 Share Posted December 13, 2019 I have a Rocktron Hex expression pedal I've connected to EXP2 on my Helix LT. When I first boot the unit, it performs correctly. However, as soon as I change presets, the Helix LT doesn't respond to the pedal. I did have to set the polarity to INVERTED (the only cable I have was inverted for a previous processor), just so you have all the facts. It doesn't matter WHICH preset I start on, it works perfectly with any preset until I change to a different one, then nothing. I'll try inverting the polarity to NORMAL to see if the issue persists. Any other troubleshooting I should try? Anyone else have an issue like this? Quote Link to comment Share on other sites More sharing options...
phil_m Posted December 13, 2019 Share Posted December 13, 2019 The issue is that standard expression pedals use TRS wiring. This is a typical schematic: Line 6 expression pedal inputs are designed for TS pedals, like this: Sometimes TRS pedals will work. I think it depends on whether or not the tip to ring connection grounds out the whole way. If they do, I think what you're experiencing happens. In short, not all pedals are compatible. If you want something guaranteed to be compatible, the Mission Engineering EP1-L6 is a good choice. 1 Quote Link to comment Share on other sites More sharing options...
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