Delay before sounds start playback

1

I tried either from code like this:
public function onRollOver()
{
_root.dbg.text += this.beepSound + "
";
this.beepSound.start(0);
}

or from timeline. I got debugging text and about 0.5-1 sec after the wav file is played back.
I don’t have any gap in the sound file. Using CS3.

Looking forward for any ideas.