dunno about the rest of youse but i turn down the stereo when trying to find an address because i'm about to be looking around at everything but the road and i want to hear any changes in my environment, which is sort of the same thing, but includes the substantial interactions between my car and the rest of the world. i do get changes in audio from visual stimulation but i think some of that is also related to microadjustments of muscles in my ears, which i would guess are related to how the optic and audio systems have trained together over the years to know where to look when you hear a sound and know how best to focus on the sounds of what you're looking at