Can't hear sound in Java

Question

I'm trying to play a bit with javax.sound.midi and I have encountered a problem - I cannot hear the sound. I have soundbank installed btw. The code looks like that:

public class MainClass {


public static void main(String[] args) {

    Synthesizer synth = null;

    try {
        synth = MidiSystem.getSynthesizer();
        synth.open();
    } catch (MidiUnavailableException e) {

        e.printStackTrace();
    }

    final MidiChannel[] mc = synth.getChannels();
    System.out.println(mc.length);

    Soundbank sB = synth.getDefaultSoundbank();
    Instrument[] i = sB.getInstruments();
    synth.loadInstrument(i[0]);
    mc[5].noteOn(60, 600);

    System.out.println("The SoundBank might be null - " + sB.equals(null));
    System.out.println("The Synthesizer is open - " + synth.isOpen());
    System.out.println(i[0]);
    System.out.println(mc[0]);


}

}

The result of System.out.println lines looks like that:

The SoundBank might be null - false 

The Synthesizer is open - true

Instrument: Piano 1      bank #0 preset #0

com.sun.media.sound.SoftChannelProxy@7d132f26

Any ideas why the sound is not played (I tried different instruments, different notes, velocities and midichannels - no effect)?