Pyle PLTV7R Owner's Manual page 26

VOLUME CONTROL ON AV MODE
To adjust audio level of AV sources on AV mode,
1. Press the VOULME < or > button.
The monitor shows following picture.
2. Press the SEARCH UP/DOWN button to select the items that you want to adjust.
3. Press the VOLUME < or > button to adjust the audio level of the selected item.
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