@Override
    public void read(JmeImporter im) throws IOException {
        super.read(im);
        InputCapsule ic = im.getCapsule(this);
        this.volume = ic.readFloat("volume", 1f);
        this.lowFreqVolume = ic.readFloat("lf_volume", 1f);
        this.highFreqVolume = ic.readFloat("hf_volume", 1f);
    }
Retrieves a unique identifier for this filter. Used internally for native object management.

@return a unique long identifier.
jme3-core/src/main/java/com/jme3/audio/BandPassFilter.java