Fade sound?

I’m trying to fade a sound loop from a seperate swf. Is this possible? What would be the correct path name?

Here’s my action for my movieClip:

onClipEvent (enterFrame) {
volumeValue = 100-_currentframe;
_root.myMusic.setVolume(volumeValue);
}

// the path for the swf that contains the sound loop is: swf/IntroLoop.swf