In case someone is having some sort of difficulty implementing fading music effects in Cocos2d-x 3.0, feel free to click link below and see my implementation.

https://github.com/joni-mikkola/cocos2d-x-tutorials

I have inherited ActionInterval class for my MusicTo class, which means that it can be used as any Action in Cocos2d-x 3.0.

To fade out music completely in 1 second:

runAction(MusicTo::create(1.0f, 0.0);


I have provided sample project with the implementation code. I downloaded the original code from somewhere in Cocos2d-x forums and modified it properly to work with Mac OS X. All you have to do, is to add files from cocos2dx/keyboard_dispatcher to your XCode project, then put following in your CCLayer inheriting class:

[code language=”cpp”]
class HelloWorld : public cocos2d::CCLayer, public cocos2d::CCKeyboardDelegate {
…
virtual void keyDown(int key);
virtual void keyUp(int key);
}

bool HelloWorld::init() {
…
CCDirector::sharedDirector()->getKeyboardDispatcher()->addDelegate(this);
}

void HelloWorld::keyDown(int key) {
CCLog("%d pressed", key);
}

void HelloWorld::keyUp(int key) {
CCLog("%d released", key);
}
[/code]

If you are having some sort of difficulties with the code, please leave a comment.