The 730 in my Ram or the 130 in my challenger seem to get louder with speed. But I cant find any settings for it. My last GM truck (2007) and Mustang (2011) you could turn it off or adjust how aggressive it is.
If anyone can figure out how to turn it off let me know...it is very annoying for the radio volume to change. Iv'e tried everything on my 2012 Dodge Ram Sport. I can find no way to turn it off. I also posted a similar question earlier and could not get an answer.