@RoderickGI thanks. The integration with OneDrive was seamless in the Windows Mobile / Phone environment. (One of the things MS got mostly right). Store your music in OneDrive Music folder and you can access without fiddling with settings on any of your Windows devices. Groove just found it and allowed you to select (on your phone) from files on your phone, files in the cloud and streaming services. Haven't yet found anything in Android environment that will do that. OK, yes JRiver will allow me to sync but I can't carry my entire music collection on my phone so, when I'm on my home LAN, I was looking for something that would access my NAS (where the bulk of the files reside). It looks like that thread you referred me too is from someone who has a similar requirement.
@seanmacdougall. Yeah, saw that on the bottom of the email about the servers. Will be very interested to see that. If they make it "OneDrive aware", I think they will find a lot of ex Windows Phone / OneDrive/Groove users interested. Add in (like JRiver on PC) being NAS aware, plus the ability to initiate a download sync from the Android device, even better.