any decent expression pedal will work with both.
Expression pedals don’t pass audio, just information .
the Mission(because of the through) will feel like a reg wa, but might not work as smooth for volume or pitch
That's what I thought too. I was just wondering if there is any actual difference between the two Mission models (SP1-L6H and EP1-KP). Both also have the same TS momentary switch, so should be identical, right?