[jony_e]

var my_sound1:Sound = new Sound();
 
my_sound1.onLoad = function() {
   if(endSong1!=1){
     my_sound1.stop();
     my_sound1.start(positionSong1/1000);
     _global.intervalID = setInterval(positionSongs, 1000);
 
  }
}
 
my_sound1.loadSound("song1.mp3", true);

приблезительно такой код