我正在尝试用我自己的声音字体替换 MIDI 文件的默认声音字体；但是，新的声音字体在旧声音的基础上播放，而不是完全取代旧声音。我的代码：
Synthesizer synthesizer = MidiSystem.getSynthesizer();
synthesizer.open();
synthesizer.unloadAllInstruments(synthesizer.getDefaultSoundbank());
synthesizer.loadAllInstruments(MidiSystem.getSoundbank(new File("Airhorn.sf2")));
Sequencer sequencer = MidiSystem.getSequencer();
sequencer.open();
sequencer.getTransmitter().setReceiver(synthesizer.getReceiver());
InputStream inputStream = new BufferedInputStream(new FileInputStream(new File("Test.mid")));
sequencer.setSequence(inputStream);
sequencer.start();