Toyota Lexusc Owner's Handbook Manual page 339

AUDIO
With rear seat entertainment system —
You can play a DVD or CD by pushing the "DISC" button when
a disc is loaded in the DVD player. Each time you push the
"DISC" button, you change between "CD" mode on the front
audio system and the DVD player. When you play the DVD
player, "AUX" appears on the display.
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In the "TAPE" or "CD" mode, the applicable functions are
shown in the lowest part of the display. Push the switch
just below to turn on each function.
(b) Adjusting audio sounds
How good an audio program sounds to you is largely
determined by the mix of the treble, mid-range, and bass
levels. In fact, different kinds of music and vocal programs
usually sound better with different mixes of treble, mid-range
and bass.
Adjusting the sound balance and selecting the listening seat
position is also important for good an audio sound.
Keep in mind that if you are listening to a stereo recording or
broadcast, changing the sound balance or listening seat
position will increase the volume of one group of sounds while
decreasing the volume of another.