Hi, the 900 radio is better than the 802 as you know but if yours is acting up and the 802 is working you might be as well sticking with it. ASC is active sound control, it alters the volume automatically when the car is noisier at speed, it has 3 levels.
I can scan you the 802 section of the handbook if you pm your email address so you can have a mess with the 802.
Rich.
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