The AC-22LX Editor requires pairing from within the app's Bluetooth settings, not by tapping "AC-22LX MIDI" in your mobile device's Bluetooth settings. If you have already tapped "AC-22LX MIDI" in your mobile device's Bluetooth settings, delete the connection, then pair from within the app. For details, refer to the "AC-22LX Editor and EV-1-WL, FS-1-WL Connection Guide".