Iphone exit button action

Question

Hi All ,

I have a problem in sound. when game background sound is playing & when i pressed exit button of iphone then application is closed. But when button is pressed then i want sound off but their is some delay in application closing. I use Application with terminating method for SDK 3.0:

     -(void) applicationWillTerminate:(UIApplication *)application
      {
      }

Can i off this sound instantly when button pressed ? Pls. help me. Thanks in Advance.