Thanks, Geoff,
I don’t think it is, actually; not sure that I can find out. Are there user-accessible log files which I could consult to find out, please? I’ve seen reference to them but don’t want to go poking around where I don’t know what I’m doing.
Very possible 
But not for long!
Understood. I’d like to think that I’ve got that under control. Yate has an excellent regex-based script (an Action in its parlance) which splits TITLE (while also retaining it in its entirety, of course) into WORK and PART for import into Roon. I think that’s working well.
I guess I could ask, please, when would I use
the second of the three options in ‘MULTI-PART COMPOSITION GROUPING’
?