Counter  Char   Byte

--- 1 --- $ --- 36
--- 2 --- j --- 106
--- 3 --- ’ --- 146
--- 4 --- $ --- 36
--- 5 ---   --- 0

--- 6 --- ’ --- 146
--- 7 --- $ --- 36
--- 8 --- g --- 103
--- 9 --- ’ --- 146
--- 10 --- $ --- 36
--- 11 ---   --- 0

--- 12 --- ’ --- 146
--- 13 --- $ --- 36
--- 14 --- L --- 76
--- 15 --- ’ --- 146
--- 16 --- $ --- 36
--- 17 ---   --- 0

--- 18 --- ’ --- 146
--- 19 --- & --- 38
--- 20 --- Z --- 90
--- 21 --- ’ --- 146
--- 22 --- & --- 38
--- 23 ---   --- 0

--- 24 --- ’ --- 146
--- 25 --- ( --- 40
--- 26 --- b --- 98
--- 27 --- ’ --- 146
--- 28 --- ( --- 40
--- 29 ---   --- 0

package dev.xred.ServlessMidiSynth;

import java.io.*;
import java.util.HashMap;

public class ServerLessMidiSynthesizer {

    private static final String MIDI_DEVICE_NAME = "dmmidi1";

    static HashMap<Byte, Thread> playing = new HashMap<>();

    public static void main(String[] args) throws IOException {

        SimpleLogger logger = new SimpleLogger(ServerLessMidiSynthesizer.class);

        try(var fis = new FileInputStream("/dev/" + MIDI_DEVICE_NAME); var buf = new BufferedInputStream(fis)){
            byte[] in = buf.readNBytes(3);

            while(loop) {
                NotePlayer notePlayer = null;
                Thread thread = null;
                logger.print((in[2] != 0 ? "pull in " : "pull out") + in[0] + " " + in[1] + " " + in[2]);

            		// Cмотрим является ли новый набор байт командой играть ноту или же терминальной командой
                if(in[2] != 0 ){
                    // Играем ноту
                    notePlayer = new NotePlayer(in[1], in[2]);
                    thread = new Thread(notePlayer);
                    thread.start();
                    playing.put(in[1], thread);
                } else {
                    //Прекращаем воспроизведение ноты
                    thread = playing.get(in[1]);

                    if(thread != null){
                        thread.interrupt();
                        thread.stop();

                        playing.remove(in[1]);
                    }

                }
                in = buf.readNBytes(3);
            }

        } catch (IOException io){
            logger.print(io.getLocalizedMessage());
        }
    }
}

package dev.xred.ServlessMidiSynth;

import javax.sound.midi.*;

public class NotePlayer implements Runnable {

    private int note;
    private int velocity;

    public boolean playOn;

    public NotePlayer(int note, int velocity){
        this.note = note;
        this.velocity = velocity;
    }

    public int getNote() {
        return note;
    }

    public int getVelocity() {
        return velocity;
    }

    @Override
    public void run() 
        var midiPlayer = MidiPlayer.getInstance();
        var mc = midiPlayer.getMidiChannel();

        velocity += 50;
        mc.noteOn(note, velocity);

      	// Стоит тут не просто так, нужен для того чтобы -
      	// выдержать длинну играемой ноты
        while(!Thread.interrupted());

        mc.noteOff(note);
    }
}

package dev.xred.ServlessMidiSynth;

import javax.sound.midi.*;

public class MidiPlayer {

    private int lastOutputed = 0;

    private static MidiPlayer instance;

    private MidiChannel[] mChannels;
    private Instrument[] instr;

 		// Полный список инструментов можно получить пройдясь по массиву instr
    private int instrumentNum = 0;
    
    private MidiPlayer(){
        Synthesizer midiSynth = null;

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

        instr = midiSynth.getDefaultSoundbank().getInstruments();
        mChannels = midiSynth.getChannels();
      
        if(midiSynth.loadInstrument(instr[instrumentNum])) System.out.println("instrument - " + instrumentNum + "has been loaded");;
    }

    public static MidiPlayer getInstance() {
        if(instance == null)
            instance = new MidiPlayer();

        return instance;
    }

    public MidiChannel getMidiChannel(){
      	// Не большой костыль - пришлось раскидать звук на несколько каналов, т.к.
      	// при тестах(игре) почему-то происходило переполнение канала
      	// из-за чего вылетало исключение
        if (lastOutputed > 3) lastOutputed = 0;
        return mChannels[lastOutputed++];
    }

}