@Override
    public Object jmeClone() {
        try {
            return super.clone();
        } catch (CloneNotSupportedException e) {
            throw new RuntimeException("Error cloning", e);
        }
    }
This method clone the Track and search for the cloned counterpart of the
original audio node in the given cloned spatial. The spatial is assumed
to be the Spatial holding the AnimControl controlling the animation using
this Track.

@param spatial the Spatial holding the AnimControl
@return the cloned Track with proper reference
jme3-core/src/main/java/com/jme3/animation/AudioTrack.java