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 9:12 pm #158655 lmcwilliParticipant Firmware test results: v5.6.0 is the most recent firmware version that supports the SP-H9 AUX switch. v 5.8.2(0) and newer don’t work with the SP-H9 AUX switch.
