Trying to add audio player progress bar

Hi
I'd like to add a progress bar to my flash audio player.
Right now you press a button, a certain sound loads and then plays.
Here's part of the code:
function playSong(e:Event):void{
    if (my_channel) {
        my_channel.stop();
    var myURL = ("mysong.mp3");
    my_sound = new Sound();
    my_sound.load(new URLRequest(myURL));
    my_channel = my_sound.play();
In order to build a progress bar I wanted to find out the length or duration of the sound but I keep getting error messages or 0s in return
trace (my_sound.duration);
tells me that duration is an undefined property
trace (my_sound.length);
trace (my_sound.position);
trace (my_sound.bytesTotal);
trace (my_sound.bytesLoaded);
all give me a 0 in return
Any idea why? Why can't I access the properties of my Sound?
I'd also be very thankful for any other suggestions on how to add a progress bar. I searched a number of websites, but most samples are AS2 code...
Thanks
Julie

Duh! Once again I thought my comuter is faster than it actually is ;-)
Thanks :-)

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