setVolume Issues

Ok, so adding some sound to the web site, all is nice and good - I can get it to play just fine. Now the primary background sound I want to be a very low volume, so you can hear the various button effects that are all working already as well.

I am using the setVolume command to just set the BG volume to a low level, lets say 15, as seen below, strange part is, it has NO effect and the volume just plays at the normal clip levels.

Suggestions? Code:

// BG Sound Controller
	var bgSound:Sound = new Sound();
	bgSound.attachSound("mainSound");
	bgSound.start(0)
	bgSound.setVolume(15);