Volvo V70XC Cross country 1998 Owner's Manual page 216

1998 Volvo SV70
The ASC function automatically adjusts the volume level of the audio system according to driving speed.
To deactivate ASC depress the "CD" button until "ASC" is no longer displayed.
To activate ASC, depress the "CD" button until "ASC" is displayed (approx. 2 seconds).
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