TU-3: Factory Reset (Initialization)
The following procedure can be used to restore the factory settings in the TU-3.
1. Turn off the TU-3 by removing the instrument cable from the INPUT jack.
2. Press and hold the MODE button and turn on the power (insert the cable into the INPUT).
3. After the TU-3 has powered on, release the MODE button and then press and release it once again.