Audio Buffer?

Question

I have a presentation that was originally developed for local playback. It consists of audio, video and xml driven content. The presentation is divided into 5 sections. Now the client wants to put the presentation on the web and I'm having a little trouble understanding how to buffer the audio. What's a good way to check if the audio is buffering? how to set the buffer?
I made a run at this once and wasn't too successful.  For each section it follows this pattern:
Load swf. Swf loads XML. XML is converted into a slides which are Flash objects. Then the first slide starts by building the slide off of the stage. Then the audio is started and then the animation starts. The problem is I can't seem to sync up the audio with the slides on the web.
Should I created a timer to check a variable to see if the audio is buffered? If so what's the code. The isBuffering code is true until the audio is fully buffered. I'm just looking for a buffer of 3 seconds and then trigger my animation to start.
Thanks

Answer 1

No I'm just using .load. Should I configure this code differently?
var s:Sound;
var sc:SoundChannel;
//======================================================================================== =================================================
//     play sound function
//======================================================================================== =================================================
function playSound(thisURL:String):void{
//sc.stop();
s = new Sound();
s.addEventListener(ProgressEvent.PROGRESS, onLoadProgress);
s.addEventListener(Event.COMPLETE, onLoadComplete);
s.addEventListener(IOErrorEvent.IO_ERROR, onIOError);
var req:URLRequest = new URLRequest(thisURL);
s.load(req);
function onLoadProgress(event:ProgressEvent):void {
  var loadedPct:uint =  Math.round(100 * (event.bytesLoaded / event.bytesTotal));
  //trace("The sound is " + loadedPct + "% loaded.");
function onLoadComplete(event:Event):void {
  var localSound:Sound = event.target as Sound;
  //trace(localSound.length);
  sc = localSound.play();
  sc.addEventListener(Event.SOUND_COMPLETE, soundCompleted);
function onIOError(event:IOErrorEvent) {
  trace("The sound could not be loaded: " + event.text);
function soundCompleted(event:Event):void {
  //trace(nextFunction);
  sc.removeEventListener(Event.SOUND_COMPLETE, soundCompleted);
  //nextFunction();