code: @Override
  	public void stopPlayback()
  	{
  		if (isNotStoppingNorStopped())
  		{
  			setIsStopping();
  			while (!isStopped())
  			{
  				try { Thread.sleep(1); } catch (InterruptedException ex) { /*noop*/ }
  			}
  			stopLine();
  		}
  	}
docs: Stopps the playback.
  Will wait until stopp is done
  @since 22.06.2006