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I have a new 2008 IS350 with navigation but no Mark Levinson. In my previous cars (mostly BMW) I could change the rate at which the radio volume increased automatically versus road speed, to compensate for, for example, noisy tires. So far, I can't find a way to do that in this car, so I end up turning the volume down each time I stop in traffic. Can someone tell me how to access that program in my nav/audio system ? Thanks.