As its a jack process you can use it on pre-printed
stereo WAVs too, but it doesn't prevent you from working on
multitrack sources like many mastering systems.
Aha - the killer feature!
The SoS feature also said that pro mastering is dominated by just two
proprietary tools, Sonic Solutions and SADiE. I haven't ever seen
either of these, but maybe there's an angle for a Linux based
alternative here.
Cheers
Daniel