Really not much to add. My C5, a 1998 red convertible, had a mellow and gutsy sounding exhaust. It was never offensive or obnoxious but it had some deep rumble and sounded strong both at idle and at higher speeds.
My C6, a 2006 silver convertible, has a far less aggressive sound, and reminds me of my family sedan. It takes away some of the sports car appeal that I like in the Corvette since it hardly makes a peep either at idle or at higher speeds.
Does it have an accent? Guess I would say it sounds like it came from Bowling Green Kentucky.....
Smarty