audio? on a 98 tc

[lowlid]

I just got a 98 tc ,I didnt get an audio manual with the car.The setup I have is a cassette in the dash with disc changer in the trunk.I have learned by trial and error most fuctions with the exception of one button when using this button it say "XXX off" or "all seats". Is this some kind of bass in the seat or what does this do? Any info would be great ,Thanks lowlid.