Devialet not recognised on Audirvana or Airfoil

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Thanks, ogs.... I've just found BubbleuPnp on the 'Net although I can't find the 'LaunchControl' that they mention when they say: "BubbleUPnP Server is found in the “Global Daemons” category". But that's by the by...

I expect LaunchControl is a reference to this application which helps you edit the preference files which control the macOS "launch daemon" (launchd).  This allows you to start programs automatically, for example at system start-up, which is likely how a server program would want to be run.