So, I noticed today, looking the odd volume control issues I’m having, that some of my Ports had been set to Pass-Through rather than Fixed.  I didn’t do it, so it must be some glitch from recent firmware updates.  These things have been fixed since forever.

So, Heads UP! Check your fixed volume components to make sure they still are FIXED!

And no, this won’t solve the laggy volume control response from the app unfortunately.