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      09-22-2009, 11:28 AM   #5
fernande-bmw
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Drives: 2010 335i E90 M-Sport
Join Date: Sep 2009
Location: Milwaukee, WI

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The speed-adjusting volume control has been a feature since 2004, I believe.

The baseline is the volume you set manually. When you accelerate, the system will increase the volume to compensate for engine noise. Then, when you slow down, it lowers the volume to the original setting.

There is a way to set the volume increment step, but I not sure how. I have never bothered with it.

Pretty cool!