Help: Loop externally loaded mp3

Ok, I’ve used this syntax to load an external mp3 into my movie

mySoundObject=new Sound();
mySoundObject.setVolume(100);
mySoundObject.loadSound(“podloga.mp3”,true)

when I add this at the end, to make the sound loop - it has no effect

mySoundObject.start(0,999);

What am I doing wrong?