public void playInstance() {
        if (positional && data.getChannels() > 1) {
            throw new IllegalStateException("Only mono audio is supported for positional audio nodes");
        }
        getRenderer().playSourceInstance(this);
    }
Start playing an instance of this audio. This method can be used
to play the same <code>AudioNode</code> multiple times. Note
that changes to the parameters of this AudioNode will not affect the
instances already playing.
jme3-core/src/main/java/com/jme3/audio/AudioNode.java