Here's a nice little idea for ME,
How about getting speed information from the GPS and using it to increase/decrease the volume.
You know like in a decent car stereo there is a feed to the speedo.
It means that as the road noise goes up the volume increases to compensate.
Wouldn't have a clue how to code it, I am just an ideas hamster, but if anyone else knows how to I think it would be great.