He does sell a software player "Master Class" for the Mac that processes digital files???
Yes, i have it. It is the cheapest entry point to try out what's being done on the DHertz Maria amps and so on.
Limitations are
a) You are tied to a Mac, might piss off windows/linux users.
b) You can use it to convert FLAC, mp3, etc files on your NAS and listen to them. You can't do such conversions with streaming content on the fly.