@Override
    public void write(JmeExporter ex) throws IOException {
        super.write(ex);
        OutputCapsule oc = ex.getCapsule(this);
        oc.write(path, "path", "");
        oc.write(stream, "stream", false);
    }
Returns the underlying audio node of this sound track
@return the pre-existing instance
jme3-core/src/main/java/com/jme3/cinematic/events/SoundEvent.java