Flash sound on/off toggle

This can't be as difficult as it seems. I want to toggle all sounds on/off. Sweet and simple. A mute button if you will.

I have seen all kinds of explanations of how to load and turn on/off a single sound. But I have sounds on my buttons and sounds on movies, etc.

I am not really looking for a treatise on the intricate interplay of blah Blah BLAH!!! :)

Something like this:

_root.Sound.setVolume(0);

or

_root.Sound.setVolume(100);