Press and hold the volume knob until it changes to a menu setup, by pressing the knob again once it should cycle to another option, keep pressing the knob until you get to DEMO. when you get to DEMO turn the knob as if you were turning the volume up or down and it should say DEMO OFF. there are many useful options in this menu, like sub control for low pass filtering, display options, turning the beep noise off/on, loud off/on, clock settings, and a few more
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