TOYOTA 2011 Prius - Manual (Page 356)

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3-2. Using the audio system
PRIUS_U (OM47685U) DVD
n Adjusting the Automatic Sound Levelizer (ASL)
Type A
When “ASL” is selected, turning to the right turns ASL on,
and turning to the left turns ASL off.
ASL automatically adjusts the volume and tone quality according to the
noise level as you drive your vehicle.
Type B
When “ASL” is selected, turning to the right changes the
ASL level in the order of “LOW”, “MID” and “HIGH”.
Turning to the left turns off the ASL.
ASL automatically adjusts the volume and tone quality according to vehi-
cle speed.