Not sure if I used the right word or not, ambient... ambiance?  Anyway...
Arcade memories I have are of sights and sounds.  Right now my cabinet has the sights, but no sounds.  When I play the games they make all the good noises and such, but if I just leave a game running, it's silent.  Is this right?  Are most games quiet in High Score/etc. mode?  Are some games noisy and I just haven't found them yet?
I want a game with some noises in the background of my gameroom.  Options?