Setting the Volume of Playing Midi Audio

 

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();
    sequencer.open();
    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));
      }
    }
  }
}

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

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