I would go crazy if the volume went up and down when passing large trucks. What to think about railroad crossings?

I would have thought that you would want the volume to go up whenever the ambient noise increased, whatever the source. The problem with mount a mike outside is that it doesn't take into account the (huge) difference between windows up and windows down. I'd imagine this difference would be even greater for those of us whose rooves (sp?) come off.

It seems to me an in-cabin mike could be better, but I don't have a solution to the feedback problem. Also, it would be interesting if you were trying to talk to a passenger above the music, but every time you raised your voice, the music got louder to compensate! :)

Richard.