Creating fading music effect in Cocos2d-x 3.0

Hello,

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);