@Override
    public void read(JmeImporter im) throws IOException {
        InputCapsule in = im.getCapsule(this);
        audio = (AudioNode) in.readSavable("audio", null);
        length = in.readFloat("length", length);
        startOffset = in.readFloat("startOffset", 0);
    }
Internal use only serialization

@param im importer
@throws IOException Exception
jme3-core/src/main/java/com/jme3/animation/AudioTrack.java