ActionScript 3.0 :: Shared Object For Global Variable Control?

The project I'm working on has grown to include multiple swf files of different types. However, the client wants the sound of all swfs controlled from the main swf. After some Google searches I came across examples of local Shared Objects and have attempted to implement what I found. However, the satellite swf in my prototype only registers the data from the LSO as "null."

I think what I need to do is encapsulate the code that defines, writes and clears the LSO in a separate .as file, call it from the .as of my main file (which already has a Document Class defined), and define the satellite files as having the LSO's .as as a Document Class. Am I correct in this line of thought?Using this article as a reference, my SO class would look something like this:

ActionScript Code:
class SO {
private var shared:SharedObject;[code]........

I'm also thinking the satellite files will mostly be using the "returnString" function, since I don't want them to write to the LSO, just to reference it.