Play music from Synology NAS

my situation is as follows.
i have a Synology NAS DS215J, on that nas i have 2 shared folders with music in MP3 and in DTS format.
no i want to play this music from one of these folder to my Denon AVR.
On my nas runs Plex and LMS.
now i want to create a awsome card from where i can choose the track and view the artist or album and so on.
then would like to play the sound true my Denon AVR which is already integrated.
i have tryed sevaral thing but without any luck.
can some of you guys give me some tips and trick on how to do this.
because of the fact that i can hardly walk i want to make my live a bit easer.
many thanks in advanced