I've searched and fiddled but still can't resolve the question. I have a number of m4a tracks that I've bought through iTunes that I want to stick on my NAS so that I can stream them over my system but no matter what I do I can't seem to make it work. My system is an iMac (with all my music on it), Synology NAS 215j, Naim ND5 XS, Naim app and Synology's media server UPnP if that helps. Any ideas on the best way to do this? Thanks.