Setting the Volume of Playing Midi Audio : MIDI Sound « Development « Java Tutorial

import javax.sound.midi.MidiChannel;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.Sequencer;
import javax.sound.midi.Synthesizer;

public class Main {
  public static void main(String[] argv) throws Exception {
    Sequencer sequencer = MidiSystem.getSequencer();;
    if (sequencer instanceof Synthesizer) {
      Synthesizer synthesizer = (Synthesizer) sequencer;
      MidiChannel[] channels = synthesizer.getChannels();

      // gain is a value between 0 and 1 (loudest)
      double gain = 0.9D;
      for (int i = 0; i < channels.length; i++) {
        channels[i].controlChange(7, (int) (gain * 127.0));

6.51.MIDI Sound
6.51.1.Load and play Midi audio
6.51.2.Playing Streaming Midi Audio
6.51.3.Determining When a Midi Audio Player Has Finished Playing
6.51.4.Setting the Volume of Playing Midi Audio
6.51.5.Play a streaming Midi audio
6.51.6.Loading and Playing Midi Audio
6.51.7.Determine the duration of a Midi audio file
6.51.8.Determining the File Format of a Midi Audio File