Advanced auto volume

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If [Speakers] is set to [TV speakers], the volume can be automatically adjusted to a certain level according to changes in the volume level of broadcasts and input signals.
Reducing the volume difference that occurs when switching channels or inputs allows you to watch at a constant volume level. To enable this feature, press the (Quick Settings) button on the remote control, then select the following settings.
[Settings] — [Display & Sound] — [Picture & Sound] — [Sound (***)] — [Advanced auto volume]