I posted about this topic in the feature request area.
ISDN ist still the best way to do it. If you know how to use it, the audio quality is pristine and you barely have delays even across the atlantic and most of all you can lock timecode.
Source connect is expensive and underwhelming so far.
Steinberg yould have taken it further and I still hope they will. Until then, my APT Tokyo stays where it is.
Steinberg, please include timecode locked video and the ADR function in vst connect.
You'd be on to a winner!
DM 2000, Neumann 7.1 System, Sequoia 12, Nuendo 6 and lots of toys