(01-11-2013 09:08)hooliganshark Wrote: Salut! First post here - thought I might try and help with this question as I am running Sonos and minidlna on a raspberry pi. (I plan to replace with minimserver when available!).
Sonos does not have a server of its own, but assumes you have music on your network shared via standard Windows file sharing or Samba. I imagine your Synology NAS includes a Samba server to share any music on the server on the network. If I understand your question correctly, the solution to your problem is (IMHO) to set up Samba on your NAS correctly to share your music folders; and then to set up the music library to access those folders via the Sonos controller software.
Sonos cannot be configured so that the music library is directly built from a UPNP server. But it is possible to play music from a UPNP/DLNA server using any control point. Any Sonos devices are visible on the network as standard renderers. Although I have no experience yet with minimserver, I expect that if properly installed, it would be visible to any control point and renderer in the normal way.
Hope this helps and bonne chance 
Thanks very much!
Regarding MinimServer and the Raspberry Pi, there is an experimental build of MinimServer 0.72 available for Raspbian. I'll send you a PM with the download details.