To restore QUADSCOPE to a known state press Right-Knob+Left-Knob+Adjust. This will restart QUADSCOPE and revert the horizontal, vertical, trigger and tuner reference pitch back to their factory default values (unless you have changed the saved settings configuration via the Menu).
QUADSCOPE can be restored to its factory default values via the main menu (press the Menu button to access this).Â
If for some reason the menu button isn't working (we've never experienced this!) the factory reset function can be executed by pressing the TOP WINDOW BUTTON and TOP WINDOW BUTTON while QUADSCOPE is powering up.