public synchronized void close()
	{		
		AudioDevice out = audio;
		if (out!=null)
		{ 
			closed = true;
			audio = null;	
			// this may fail, so ensure object state is set up before
			// calling this method. 
			out.close();
			lastPosition = out.getPosition();
			try
			{
				bitstream.close();
			}
			catch (BitstreamException ex)
			{
			}
		}
	}