When operating the knobs [1–3] on the GT-1B, the message "KNOB IS LOCKED" appears if the KNOB LOCK function is activated This prevents settings from being changed inadvertently on stage or in other such situations.
Use the following procedure to turn off or deactivate KNOB LOCK:
- Press the [MENU] button.
- Select PLAY (PLAY OPTION).
- Set KNOB LOCK to OFF.