Which firmware is installed on your M13? (Enter the Tuner mode by holding down the "Tap" switch for 5 seconds). The FX(2) Unit screen will display a Version # (1.07 is most current).

To do a Factory Reset:

1. Hold the "Looper Controls" switch down for about 5 seconds.

2. On the FX(4) Unit screen (rightmost screen of the 4), turn the "Model Select" knob all to the right 2 clicks/notches.

3. It should read "RST FACT?".

4. Press DOWN on the "Model Select" knob. The screen will read "RESET: Reset to Factory? Are you sure?"

5. Press DOWN again on the "Model Select" knob. After 5 seconds, you should see a: Yellow/Blue/Green/Red FX screens scene state.

That's it. Hopefully this explanation makes sense to you.

Sounds like a bad knob, most likely. Perhaps the fastest option for you is to go back to GC and return this for another new M13. Please be sure to test the operation of ALL knobs and functions before leaving the store for home with the new one.

Also, let GC know that they need to get your current unit serviced.

Regards,

L6P