Toyota Lexusc Owner's Handbook Manual page 320

Each time you push the "AUDIO CONTROL" knob, the
mode changes as in the following.
POS: Select one of the following listening seat positions.
1: Front seat priority mode
2: Rear seat priority mode
3: All seats mode
4: Driver seat priority mode
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.
ASL: Turns on or off the automatic sound levelizer.
Automatic sound levelizer: When the audio sound becomes
difficult to be heard due to road noise, wind noise, etc. during
driving, the system adjusts to the optimum volume and tone
quality according to the noise level. While the automatic sound
levelizer is on, "ASL" appears on the display.
Push the "AUDIO CONTROL" knob until the desired mode.
Turn the knob to suit your preference.
(c) Your radio antennas
Detachable antenna: To remove an detachable antenna,
carefully turn it counterclockwise.
AUDIO
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