1) how did you connect the pedal? pedalboard or kemper directly? Expression pedal directly to Kemper.
2) did you wire the exp pedal cable as requested? I do not know what you are talking about. The expression pedal has a stereo (type) jack on it.
3) did you try another exp pedal to see if you have the same result or issue? I tried an Ernie Ball volume pedal and it is even worse.
4) if connected to the kemper, did you try to initialize the pedal since the kpa lets you do it? I plug the pedal in but neither initial button illuminates. If I do depress the intialize 1 button nothing happens.