ActionScript 2.0 :: Mute Button Not Working In Embedded SWF

The mute button code I have works perfect when the SWF is played itself, but when it is embedded in a wrapper SWF it no longer works. I know that it is the code that references _loc1. I have the root locked in the first frame of the embedded swf with this:

Code:
this._lockroot = true;

Here is the code in question. I just need to know how to change this code to make it work when this SWF is embedded in another SWF:

Code:
btn.onPress = function () {
var _loc1 = _root.snd.getVolume();
_root.snd.setVolume(Math.abs(_loc1 - 100));

[Code].....