First, check which expression pedal you’re using and whether it has a polarity switch, as this can affect compatibility.
Connect a TRS cable from the pedal to one of the Pedal inputs on the back of the Kemper (Pedal 1 or Pedal 2).
On the Kemper, go to System, then Pedal Settings. Select the input you used (for example, Pedal 1) and set it to “Wah Pedal.” If needed, calibrate the pedal by moving it through its full range.
Add a Wah effect in one of the stomp slots. Make sure the “Pedal Mode” is set to something like “Bypass @ Heel,” so the wah turns off when the pedal is in the heel position.
TOTALLY worked!. Thanks! I owe you a beer!