Lexus ES300 Owner's Manual page 192

AUDIO
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) Tone and balance
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.
A good balance of the left and right stereo channels and of the
front and rear sound levels is also important.
Keep in mind that if you are listening to a stereo recording or
broadcast, changing the right/left balance will increase the
volume of one group of sounds while decreasing the volume
of another.
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Each time you push the "AUDIO CONTROL" knob, the
display changes as in the following. To adjust the tone
and balance, turn the knob.
BAS: Adjusts low pitched tones.
MID: Adjusts mid pitched tones.
TRE: Adjusts high pitched tones.
FAD: Adjusts the sound balance between the front and rear
speakers.
BAL: Adjusts the sound balance between the right and left
speakers.