有人可以告诉我如何在 不 使用声音库或合成器的 情况下 控制MIDI音序器的音量吗？

我想先使MIDI淡出，然后依次继续下一个MIDI

            if(midiplay)
            {

                midi = s + savereq;
                try {
                    //System.out.println("Play MIDI " + midi);
                    if (musicSr != null)
                    {
                                               /* This is where I want it to fade out*/
                        musicSr.stop(); //stop sequencer
                        musicSr.close(); //close sequencer
                    }
                    musicSr = null; 
                    musicS = null;

                    File music = new File(midi);
                    if(music.exists())
                    {
                        musicS = MidiSystem.getSequence(music);
                    }

                    // Create a sequencer for the sequence
                    musicSr = MidiSystem.getSequencer();
                            musicSr.open();
                            musicSr.setSequence(musicS);
                            musicSr.setLoopCount(musicSr.LOOP_CONTINUOUSLY);
                            musicSr.start();

                } catch (Exception ex) {
                    ex.printStackTrace();
                }


                midiplay = false;

            }