106     AudioServicesPlaySystemSound(selSound);

   106     AudioServicesPlaySystemSound(selSound);

   107 }

   107 }

   108 

   108 

   109 #pragma mark -

   109 #pragma mark -

   110 #pragma mark memory management

   110 #pragma mark memory management

   112     [backgroundMusic stop];

   112     [backgroundMusic stop];

   113     [backgroundMusic release], backgroundMusic = nil;

   113     [backgroundMusic release], backgroundMusic = nil;

   114     AudioServicesDisposeSystemSoundID(clickSound), clickSound = -1;

   114     AudioServicesDisposeSystemSoundID(clickSound), clickSound = -1;

   115     AudioServicesDisposeSystemSoundID(backSound), backSound = -1;

   115     AudioServicesDisposeSystemSoundID(backSound), backSound = -1;

   116     AudioServicesDisposeSystemSoundID(selSound), selSound = -1;

   116     AudioServicesDisposeSystemSoundID(selSound), selSound = -1;