Music begins playing before my external preloader is complete. Can anyone help?

Question

Hi, I'm hoping someone can help with this. My code for the external preloader is below: (not sure why the odd boxes are showing up)
function launchSWF(vBox, vFile):void{
var swfLoader:Loader = new Loader();
//vBox.addChild(swfLoader);
var swfURL:URLRequest = new URLRequest(vFile);
swfLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgressHandler);
swfLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadProdComplete);
swfLoader.load(swfURL);
function loadProdComplete(e:Event):void {
trace("swf file loaded");
vBox.removeChild(preLoader);
vBox.addChild(swfLoader);
currentSWF = MovieClip(swfLoader.content);
currentSWF.gotoAndPlay(1);
currentSWF.addEventListener(Event.ENTER_FRAME , checkLastFrame);
function checkLastFrame(e:Event):void {
if (currentSWF.currentFrame == currentSWF.totalFrames) {
     currentSWF.stop();
    // trace("DONE");    
var preLoader:loader = new loader();
preLoader.x = 345;
preLoader.y = 340;
vBox.addChild(preLoader);
function onProgressHandler(event:ProgressEvent){
var dataAmountLoaded:Number=event.bytesLoaded/event.bytesTotal*100;
preLoader.bar.scaleX = dataAmountLoaded/100;
preLoader.lpc.text= int(dataAmountLoaded)+"%";
trace(preLoader.bar.scaleX );
var container:MovieClip = new MovieClip();
var swfFile:String = 'WashingtonGas.swf';
var currentSWF:MovieClip = new MovieClip();
launchSWF(container, swfFile);
//put it on stgae
addChild(container);
Thank you!

Answer 1

I think the problem is that my as3 knowledge is too limited for me to do anything other than directly follow a tutorial, use code snibbets, etc. I'm feeling like this should be easy but even with your suggestions, its not coming together, unfortunately.
When I add the sound via actionscript, it still loads too early and I also then can't figure out how to turn it on/off with the button I have in the swf. When I add a simple play(); and stop(); it only stops my animation in the swf. Here is my working url in case that sparks anything!
http://www.rowhouseco.com/WashingtonGas/