Samsung UN19D4000ND E-Manual page 50

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Auto❑Volume❑(Off❑/❑Normal❑/❑Night)
Normal
channels, the volume level is the same.
Night equalizes and decrease the volume level on each channel, so each
channel is quieter.
volume low.
If connecting to an external device using the HDMI/DVI cable, it is
N
recommended to turn off Auto❑Volume. Control as this option may
compromise the volume setting controlled by the external device.
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equalizes the volume level on each channel, so that when you change
Night is useful at night, when you may want to keep the
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