This is probably one of the only things I miss from when I sold my Kemper. Being able to have your favorite cab locked and then see how all your presets sound with it was cool.
I run cab sims to FOH but I always run a send out to a 2x12 cab w/ an EHX 44 magnum power amp for stage noise so I get the best of both worlds. If you only need stage noise the 44 magnums are plenty loud, im not sure about miking them up but honestly I reckon it would sound pretty sweet and they are cheap as chips.
Its an Ernie Ball VPJR 250k, for passive electronics. It's got 3 jacks: in, out and tuner. I've been using one of those 2 mono to 1 stereo cables (insert cable?) which I assumed was TRS but im guessing im wrong haha.
Sorry to bump this up but I'm currently having this exact issue when connecting my Earnie Ball volume pedal, it goes from 0 to 100 then just before the pedal is all the way up it goes to 0 on the helix again. I have tried reversing the TRS cable connections as well but same issue.