С Битник создал РМФ, звуков штук 10(вавки), один инструмент, звуки идут последовательно. Но то ли надо как-то свой custom bank выбрать, то ли еще что-то... но играется стандартное пианино.

    import java.io.File;
    import java.io.IOException;
    import javax.sound.midi.InvalidMidiDataException;
    import javax.sound.midi.MidiSystem;
    import javax.sound.midi.MidiChannel;
    import javax.sound.midi.MidiUnavailableException;
    import javax.sound.midi.Soundbank;
    import javax.sound.midi.Synthesizer;

    public class MIDITest
    {
      public static void main(String[] args) throws MidiUnavailableException, InvalidMidiDataException, IOException
      {
        try
        {
        // create synthesizer
        Synthesizer synth = MidiSystem.getSynthesizer();
        synth.open();
        out("Synthesizer device info: " + synth.getDeviceInfo());
        out("Defaut soundbank: " + synth.getDefaultSoundbank());

        // load soundbank
        Soundbank soundbank = MidiSystem.getSoundbank(new File("./normal2.rmf"));
        out("Soundbank description: " + soundbank.getDescription());
        out("Soundbank name: " + soundbank.getName());
        out("Soundbank supported: " + synth.isSoundbankSupported(soundbank));

        // get instruments
        synth.unloadAllInstruments(soundbank);
        synth.loadAllInstruments(soundbank);
        for (int i = 0; i < soundbank.getInstruments().length; i++) 
        {
            out("Name of instrument[" + i + "]: " + soundbank.getInstruments()[i].getName());    
        }
        
        out("Needed bank: " + soundbank.getInstruments()[0].getPatch().getBank());
        out("Needed midi program: " + soundbank.getInstruments()[0].getPatch().getProgram());

        // setProgram
        MidiChannel channel = synth.getChannels()[0];

        // выбираем второй bank
        channel.programChange( soundbank.getInstruments()[0].getPatch().getBank()-1, 
                soundbank.getInstruments()[0].getPatch().getProgram()-1);

          for (int i = 0; i < 10000; i++)
          {
            channel.noteOn(i, 100);
            Thread.sleep(200);
            channel.noteOff(i);
            System.out.println(i);
          }
        }
        catch (InterruptedException e)
        {
            e.printStackTrace();
        }
      }

      private static void out(String strMessage)
      {
        System.out.println(strMessage);
      }
    }



В консоли:
Synthesizer device info: Java Sound Synthesizer
Defaut soundbank: com.sun.media.sound.HeadspaceSoundbank@18e2b22
Soundbank description: Soundbank for use with Java Sound Audio Engine
Soundbank name: Patches.hsb
Soundbank supported: true
Name of instrument[0]: New Instrument
Needed bank: 4
Needed midi program: 1
0
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