When using the DUAL CUBE LX Editor, you must pair from the app’s Bluetooth settings screen, rather than tapping “DUAL CUBE MIDI” shown on the Bluetooth settings screen of your mobile device.
If you’ve accidentally connected to “DUAL CUBE MIDI” on your mobile device’s Bluetooth settings screen, unpair (or delete the connection) with “DUAL CUBE MIDI”, and go to the Bluetooth settings screen in the app to pair.
For details on how to connect, refer to the “Connecting the DUAL CUBE LX Editor iOS App to the DUAL CUBE LX” or “Connecting the DUAL CUBE LX Editor Android App to the DUAL CUBE LX”.