Control volume of ALL audio (incl. of flv)

Hi

I’m creating a flash presentation that contains some externally loaded video’s (flv), voiceovers and a background music. I would like to be able to control all these audio streams with one control. So basically I’d like to change the volume of the entire movie. Is this possible?

I know there’s something like the Sound object with a setVolume() method, but that’s only to control one stream as far as I know.

I just need to know if it’s possible to control all audio with one statement. Something like _root.setVolume() or something?

Thanks