e721. setting the volume of playing midi audio.txt

这里面包含了一百多个JAVA源文件

 // To create a Sequencer object, see e716 Loading and Playing Midi Audio
    
    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));
        }
    }