Hmmm .... I'd forgotten about Elisa. I found it on my laptop, and it's on my media machine as well, but I haven't looked at it for a long time, for some reason. When I just tried it on the laptop, it was unable to load any music from my collection, though that NAS share is easy to browse on Dolphin, so it should be visible to any application.
If I go to the "Refresh" item in the menu, it seems to start, and the gear icon spins for about 4 seconds, then stops and nothing has been added. Done that several times, then I reinstalled Elisa, and nothing changed. I checked Elisa on the media machine, and the same thing happened there. Raspberry saw and loaded the entire library on that computer, so I know it's present and available.