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EDID interface
7.3. Audio Setting
7.3.1. Audio input setting
Press the "Left/Menu" on the panel to enter the "Audio" menu,
Press the "Up" or "Down" on the panel to select, press the "Enter" to confirm the
selection, the selected one has a "@" to mark,
For HDMI input1 and HDMI input2, there is "CH2.0" and "CH5.1" to choose, default
is CH2.0, Support digital audio 5.1 channel only when input is HDMI.