Thanks for the reply, I guess that makes sense, bit of a shame but I think I'll be able to make the exp pedal guts trick work.
I currently use an external Moog expression pedal with a TS connection in exp2 assigned to a bunch of parameters on different blocks however I've found it to be rather imprecise even when fiddling with the knob on the pedal.
About 50% of the treadle play takes it from 0-100 on the helix so its essentially an off or on switch rather than a precise expression controller.
Is there a way to fix this within the expression setting on the helix? My search has been unsuccessful so far.
Thanks