Crown Audio by Harman

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How can I lock the front panel of the USM-810?

On the general tab of the USM-810 from there is a button that indicates "Lock Out Front Panel Controls" Engage this button on to make it so that the three buttons on the front panel of your mixer do not control anything. Presets cannot be selected from the front panel of the unit when this feature is engaged. The front panel display will change to begin with an "L."