Home › Forums › Products › Stompboxes › Mission Engineering SP-H9 expression pedal AUX switch not working › Reply To: Mission Engineering SP-H9 expression pedal AUX switch not working September 14, 2021 at 7:36 pm #158652 lmcwilliParticipant Hi James, Firmware does seem like a promising candidate for the problem cause. I’ll go back to v 5.8.5. Tx
