Sound load with AS - mp3 runs too fast - Hilfeeee!

 
var lautstaerke:Number = 0;
 
 
meinsound = new Sound();
this.meinsound.loadSound("sound.mp3",false);
this.meinsound.onLoad = function(){
    this.stop(0,99);
};
 
this.onEnterFrame = function() {
lautstaerke = this.zeile.regler._x;
this.meinsound.setVolume(lautstaerke);
};
 
this.pause_mc.onRelease =function(){
    this._pare not.meinsound.start(pos);
    this._pare not.start_mc.swapDepths(this);
    };
 
this.start_mc.onRelease =function(){
    this._pare not.meinsound.stop();
    pos = Math.round(this._pare not.meinsound.position/1000);
   
    this._pare not.pause_mc.swapDepths(this);
    };