28 

    28 

    29 +(void) playBackgroundMusic;

    29 +(void) playBackgroundMusic;

    30 +(void) pauseBackgroundMusic;

    30 +(void) pauseBackgroundMusic;

    31 +(void) stopBackgroundMusic;

    31 +(void) stopBackgroundMusic;

    32 

    32 

    33 +(void) playClickSound;

    36 +(void) playClickSound;

    34 +(void) playBackSound;

    37 +(void) playBackSound;

    35 +(void) playSelectSound;

    38 +(void) playSelectSound;

    36 

    39 

    37 +(void) releaseCache;

    40 +(void) releaseCache;