I have one of these great cards too & searched for a long time to find a manual for it.
These days the manuals tucked away somewhere in storage, so this
PDF file local on my HD is really welcome!! Thanks Plaz!
Meanwhile...this reminds me that I was in contact with the guy that
wrote the AHI driver for the AD516, as well as Maurizio C at AudioLabs.
Seems there was some sort of hardware banging going on when ProStationAudio was
set up to access AHI via the AD516 driver (other AHI drivers worked ok). They were
in close contact over this issue trying to resolve what was happening, and how to fix it. Hmmmm.....
Any one else have similar problems??