Calculate Audio play progressing time

private var sound:Sound = new Sound()
private var channel:SoundChannel = new SoundChannel();

sound.addEventListener(ProgressEvent.PROGRESS, onProgress);

private function onProgress(event:ProgressEvent):void{
var percentLoaded:Number = event.bytesLoaded / event.bytesTotal;
var approxProgress:Number
= channel.position / sound.length * percentLoaded;
// Update your progress bar based on approxProgress
}