Thanks both!
I'll try to keep this brief so as not to wear out your goodwill.
First and foremost, I now have music playing from my Windows PC through Rune, via the C1+ and I2S DAC to my hifi setup (amp -> headphones/'speakers)
I think the problem I've been having is - as you've both suggested - rooted in my eccentric approach to organising my audio collection. For classical music I have little (?no) use for playlists and completely eschew "albums" and "songs" (and "album art"!), preferring instead to use the file heirarchy to reflect genre, composer and performer/s. I've tried repeatedly to reconcile this approach with the tagging (and all the rest of the paraphenalia) of the various archiving software suites to be found on the net, but have had to give up every time so far. Also I have no desire to stream music from any source other than my own collection of music files.
So MPD's functionality (and not only MPD's) is mostly wasted on me.
I've now discovered that I wrote-off TVersity too quickly, because that's what I'm now using. Running it on Windows I'm able to "push" ("cast" as TVersity terms it) audio files to Rune by selecting in TVersity the file-path of the folder in which that audio file resides. This was all I've been aiming to do from the the start and - barring accidents - TVersity seems able to do it.
Interestingly MPD's player also plays-back the same audio file as is selected, and played-back by, TVersity's player running in Windows. But I'm unable to select the file through MPD (or not without tailoring how I organise my audio files to MPD's demands, which I've no need to do if TVersity gives me what I want).
Not so brief! I can only hope some of this experience may benefit someone else sometime.
And I'd like to add that I think RuneAudio is great, and so is its support.
).
