This applet launches a self-modifying MusicShape whose Instrument is a MidiInstrument. JMSL.midi is set to MidiIO_JavaSound
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source code

JavaSound MIDI needs a soundbank to playback MIDI notes. A soundbank does not ship with the Java runtime, so users must either install one by hand or the developer may post a soundbank on the same server as the applet to be loaded at runtime, as the code excerpt below demonstrates

  private void initMIDI() {
        JMSL.midi = MidiIO_JavaSound.instance();
        try {
            ((MidiIO_JavaSound) JMSL.midi).setSoundbankURL(new URL(getCodeBase(), "javasound/soundbank-min.gm"));
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        JMSL.midi.edit(new Frame());
        JMSL.midi.open();
    }