if (dev == null) return null;
    static Receiver getReceiver(int port) throws MidiUnavailableException {	if (midiOutRcvr[port] != null)	    return midiOutRcvr[port];	MidiDevice dev = getOutputMidiDevice(port);		if (dev == null)	    return null;	Receiver r = dev.getReceiver();	midiOutRcvr[port] = r;	return r;    }