[Ostgur]

var my_mc:MovieClip = this.createEmptyMovieClip("my_mc", this.getNextHighestDepth());
var my_mc1:MovieClip = this.createEmptyMovieClip("my_mc1", this.getNextHighestDepth());

var movie_sound:Sound = new Sound(my_mc); 
movie_sound.loadSound("music.mp3"); // музыка
movie_sound.start();
movie_sound.setVolume(60);

var movie_sound1:Sound = new Sound(my_mc1);
movie_sound1.loadSound("song.mp3"); // песня
movie_sound1.start();
movie_sound1.setVolume(80);