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    <p>Try This, I used this Code and worked always.</p> <pre><code>@interface AppController : NSObject &lt;UIApplicationDelegate&gt; { bool isMusicOn; … } @property (nonatomic, assign) bool isMusicOn; @end @implementation AppController @synthesize isMusicOn; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { if([[NSUserDefaults standardUserDefaults] objectForKey:@"isMusicOn"] != nil) { self.isMusicOn = [[NSUserDefaults standardUserDefaults] boolForKey:@"isMusicOn"]; } else { self.isMusicOn = true; } if(self.isMusicOn) { [SimpleAudioEngine sharedEngine].backgroundMusicVolume = 1.0f; } else { [SimpleAudioEngine sharedEngine].backgroundMusicVolume = 0.0f; } } -(void) applicationWillResignActive:(UIApplication *)application { [[NSUserDefaults standardUserDefaults] setBool:self.isMusicOn forKey:@"isMusicOn"]; [[NSUserDefaults standardUserDefaults] synchronize]; } @end //Create Music button in your Cocos2d Scene @interface MySettingsScreen : CCLayer { CCMenuItemSprite *mMusicBtn; . . . } //in implementation file -(void)createButton { AppController *app = (AppController*)[UIApplication sharedApplication].delegate; NSString *imgName = ((!app.isMusicOn) ? @"mute.png" : @"musicOn.png" ); CCSprite *music_1 = [CCSprite spriteWithSpriteFrameName:imgName];//spriteWithFile if png is from file CCSprite *music_2 = [CCSprite spriteWithSpriteFrameName:imgName]; music_2.color = ccc3(200,200,200); mMusicBtn = [CCMenuItemSprite itemWithNormalSprite:music_1 selectedSprite:music_2 target:self selector:@selector(musicBtnPress:) ]; mMusicBtn.position = ccp(mS.width*0.25f, mS.height*0.1549f); } -(void)musicBtnPress:(id)sender { AppController *app = (AppController*)[UIApplication sharedApplication].delegate; if(app.isMusicOn) { [SimpleAudioEngine sharedEngine].backgroundMusicVolume = 0.0f; app.isMusicOn = false; mMusicBtn.normalImage = [CCSprite spriteWithSpriteFrameName:@"mute.png"]; //spriteWithFile if png is from file mMusicBtn.selectedImage = [CCSprite spriteWithSpriteFrameName:@"mute.png"]; //spriteWithFile if png is from file } else { app.isMusicOn = true; [SimpleAudioEngine sharedEngine].backgroundMusicVolume = 1.0f; mMusicBtn.normalImage = [CCSprite spriteWithSpriteFrameName:@"musicOn.png"]; mMusicBtn.selectedImage = [CCSprite spriteWithSpriteFrameName:@"musicOn.png"]; [[SimpleAudioEngine sharedEngine] playBackgroundMusic:@"gr-theme.m4a" loop:YES]; } } </code></pre>
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