public void setInnerAngle(float innerAngle) {
        this.innerAngle = innerAngle;
        if (channel >= 0)
            getRenderer().updateSourceParam(this, AudioParam.InnerAngle);
    }
Set the directional audio node cone inner angle.
Does nothing if the audio node is not directional.

@param innerAngle The cone inner angle.
jme3-core/src/main/java/com/jme3/audio/AudioNode.java