I had a 2002 Chevy Impala with volume compensation, and when it was set on medium, it was noticeable and worked outstandingly. I recall the interior noise was about the same as my XC60 when driving, and the compensation was perfectly matched at medium to keep the sound level consistent from a stop to 60 mph.
The volvo's seems to not work at all, period. absolutely no change in volume even when set to high, i have to turn the sound up when driving even at 30 mph, then turn it down again when stopping.
Is mine not working? Please let me know if and how well yours is working.