About Automatic Sound Levelizer (Asl) - Lexus GS350 Owner's Manual

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5-3. Using the audio system
The sound quality level is adjusted individually
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The treble, mid and bass levels can be adjusted for the each audio mode separately.

About Automatic Sound Levelizer (ASL)

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ASL automatically adjusts the volume and tone quality according to the vehicle
speed, wind noise or other noise.
GS350_OM_OM30D41U_(U)