web-based audio library that can stream to DLNA?

Hi,
At the moment I have all my FLAC in a Synology.
I also have two DLNA streamers (Neet aristream and my Denen AV Amp).

Synology gives you a media server and a really bad 'audio service' which is a webapp for streaming and library management. I tried to use it with my Neet streamer and it didnt work. Its also bad when it comes to searching for things.

So, Im looking for alterantives:
1) with a web interface that can use a existing ynology DLNA db or even build a new one from a shared folder
2) manage, search and play flac etc (like an itunes on web)
3) play the audio through the DNLAs ___not___ "locally" or "via the browser"
4) linux or docker based please! Daphile for example is cool but can only use DACs attached to the systems (right????)

Thanks!