[Hauts]

Читайте хэлп, там всё есть.

Контроль загрузки звука:

this.createTextField("message_txt", this.getNextHighestDepth(), 10,10,300,22)
this.createTextField("status_txt", this.getNextHighestDepth(), 10, 50, 300, 40);
status_txt.autoSize = true;
status_txt.multiline = true;
status_txt.border = false;
 
var my_sound:Sound = new Sound();
my_sound.onLoad = function(success:Boolean) {
    if (success) {
        this.start();
        message_txt.text = "Finished loading";
    }
};
my_sound.onSoundComplete = function() {
    message_txt.text = "Clearing interval";
    clearInterval(my_interval);
};
my_sound.loadSound("song2.mp3", true);
var my_interval:Number;
my_interval = setInterval(checkProgress, 100, my_sound);
function checkProgress(the_sound:Sound):Void {
    var pct:Number = Math.round(the_sound.getBytesLoaded()/the_sound.getBytesTotal()*100);
    var pos:Number = Math.round(the_sound.position/the_sound.duration*100);
    status_txt.text = the_sound.getBytesLoaded()+" of "+the_sound.getBytesTotal()+" bytes ("+pct+"%)"+newline;
    status_txt.text += the_sound.position+" of "+the_sound.duration+" milliseconds ("+pos+"%)"+newline;
}