Congratulations on your first post.
You could get a separate solution audio, like Sonos, Logitech or Apple. Those audio-only devices do a much better job than the video devices, which tend to ignore audio. Since you already have a Dune, you can't really improve on your video playback. I wish I could help with an audio solution, but I have limited my audio playback to Audiotrons
and the Netgear NeoTV-550
As far as I know, only the NeoTV-550 and the AppleTV can play gapless music. You might want to consider the AppleTV if you already have some Apple infrastructure. I don't, so I won't be of much help there either.
The NeoTV plays all of the audio formats that I know, as well as having the best jukebox of all of the players I've tried. I run the Zappiti jukebox on my Dune, but the Neo jukebox is far more capable. It works better for video as well as music, although it is a little buggy. The Neo is not nearly as bug-free as the Dune, and it doesn't work for everybody because of that. But I have not come across those bugs. It is also at end-of-life, but as you can see from my Audiotrons
, that is not something that bothers me. I find, for playing DVDs and Blu-Rays from my NAS, that the Neo as almost
on par with the Dune.