Lexus LX 570 2009 Manual page 392

3-3. Using the audio system
Setting DSP (Digital Signal Processing)
The following features can be set as desired by touching
screen:
Without DVD player
With DVD player
■
Turning Automatic Sound Levelizer (ASL) "ON" or "OFF"
Touch
ASL automatically adjusts the volume and tone quality according to the
noise level as you drive your vehicle.
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