Now apologies if I have missed something fundamental but…
I am creating a headless server but using the SimpleApplication for ease of use. When setting up a null renderer you use the AppSettings.NULL constant. However, if you want the Audio Renderer to be ignored you have to set the value to null as the check is:
if (settings.getAudioRenderer() != null){
audioRenderer = JmeSystem.newAudioRenderer(settings);
audioRenderer.initialize();
listener = new Listener();
audioRenderer.setListener(listener);
}
I would have thought the NULL constant should be used for all ‘null’ settings for consistency? Like I said, feel free to correct and abuse me if I am just being dumb, it happens…
Matt
Yeh, I agree 
But actually now you can set the video renderer by using “null” too 