Toyota Corola Owner's Manual page 293

Automatic sound leveliser (ASL)
1 Select "Automatic Sound Levelizer".
2
Select "High", "Mid", "Low" or "Off".
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About Automatic Sound Leveliser (ASL)
ASL automatically adjusts the volume and tone quality according to the vehi-
cle speed.
COROLLA_TMMMS_TMMC_U (OM12F00U)
5-12. Setup (Multimedia system)
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