The sound/volume leveler is binary--either on or off; I don't see any settings for levels (low, med, high). When driving with high road and wind noise and then coming to a complete stop, there is absolutely no change in the audio system volume.. The Automatic Sound Levelizer (ASL) does not seem to work. According to NAV system owners manual, page 152 states: When the audio sound becomes diffcult to hear due to road noise, wind noise or other noises while driving, select "ON". The system adjusts to the optimun volume and tone quality according to the speed of car.

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ASL, or Auto Sound Levelizer, is an innovative feature that aims to enhance the driving experience by automatically adjusting the volume and tone settings of the audio system to compensate for changes in vehicle speed and road noise.. I took home my 2015 xle camry and couldn't believe how terrible the sound was on the stereo system. The treble, mid range and bass controls did almost nothing. (I am a professional musician). I then found that this "automatic level sound levelizer. I unchecked it, and it turned from one of the worst audio sound systems to one of the best.