I have a non nav, single disc radio. I find the ASL doesnt really help at all. No matter how fast I go, the sound level stays the same and I have to manually adjust the volume. A weird thing is when I park my car and step the handbreak (or should it be called footbreak?) to half way down, my radio would suddenly turn up the volume for 0.2 seconds and lower back to normal volume as I keep on stepping down the handbreak.