Lexus GS430 User Manual page 312

AUDIO
(c) DSP control
G22008
To display the DSP control mode, touch the "DSP" switch
displayed on the audio control mode screen. You can turn
on/off the automatic sound levelizer, or select the position
on the DSP screen.
Automatic sound levelizer (ASL):
When the audio sound becomes difficult to be heard due to
road noise, wind noise, etc. during driving, touch the "ASL"
switch. The system adjusts to the optimum volume and tone
quality according to the noise level.
When the system is on, the sound adjustment level is
displayed on the screen.
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Positioning selector:
By selecting the listening position, the system controls the
output timing of the speakers to allow sound to be heard
evenly, creating the ideal music environment.
Touching "CHANGE" the position switches in the following
order; all seats, driver's seat, front seats and rear seats.
The POSITION currently selected is displayed on the screen.