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About the control panel and interface
PANNEL CONTROL KNOBS
Input: Press this button to change input source.
Menu: Press this button to display or exit the OSD menu.
CH▲/: When the OSD menu appears, press these two buttons to select the item you want to execute; when no OSD menu appears, use to change channels in TV mode.
Vol ▲/: When the OSD menu appears, press these two buttons to select or adjust the selected item; when no OSD menu appears, use to adjust the volume.