Controlling Sound

I am loading an external FLV file and I want to control the sound using AS. How will I be able to do this. I have the following code but it controls all the volume for the entire SWF file and thats not what I want. Here is the code.

var global_sound:Sound = new Sound();

I want to be able to control a particular FLV out of 3 that are being loaded.
Hope I was Clear enough