Albert, have you compared Audirvana to Pure Music or Amarra?
Maybe you could update us on a new thread when you figure this all out. I'm anxious to get on with it, but the tinkering is daunting.
So far, all I've tried, in addition to playing iTunes through my Squeezebox 3 to my DAC, is playing the HDTracks FLAC samples from a folder separate from iTunes. But, I have to change the library in the SB program to access it, then switch back to choose iTunes.
I was thinking of using the Squeezebox Touch as an interface, but, as Jax2 notes, it won't pass higher than 24/96.
Needless to say . . . I'm a bit confused.