Steve,
Thanks very much - that is exactly the sort of practical advice I was looking for.
I already have and use a Motu Ultralight mk5, so I'll take your advice and do it that way.
Essentially, one ethernet cable to the Roon endpoint/Motu and then six balanced analogue cables from that to...
Bernt, I'm in exactly the same situation as Mike-48. I understand your answer - reasonably enough, it is about how to create the filters in the first place - which is what Audiolense is for.
However, I *think* most of Mike-48's question (and certainly my main question) is how to use those...