Thanks for testing, I found the bug for the album art image. It was a typo in the channel definition. I pushed the latest changes to github with preliminary player control, the fix for the album art and some work toward selecting and controlling different zones. Adding Artist / Title / Album info should be straight forward, will add those when I have sometime. After that I will explore adding the speakers as audio sinks. I haven’t deal with room scenes or room presets so I can not comment on that at this moment.
Edit: Added the latest compiled jar to github releases just in case anyone else wants to test it.