Some of the early models in the US had a speed sensitive volume for the stereo. The faster you went, the louder it gets.
By the time we got to the 840 in '93/'94 it was no longer installed.
My 94 model has a speed sensitive radio 
I guess that they decided that here in the US we shouldn't be listening to the radio anyway if we were going to go fast 
my 94 840ci has speed sensitive volume control. at first i thought even squeezing the volume knob altered things... or do they??
I just went and looked it up and the 94 and 95 models do have a speed input to the radio.
Thats what I get from relying on memory i guess 
Curiously the '91 had both a tachometer / speed signal and an I bus connection to the body computer and the laters only have a speed signal.
Mine's also a 97 with the factory head unit upgrade (badged "Professional").
This doesn't "jump" in volume - it increases progressively with speed.
It is not proportional to revs.
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