Seems to depend on what rev your AD1K is. From what I read on those posts, and from what I have been looking at, studying linking a V3>MT 24/96 with a 722, any of the inputs, S/PDIF, BNC or AES/EBU will pick up a wordclock signal from another device. I would read the AD1K manual, but it may be as simple as any S/PDIF input doing the trick.