Thanks a million, Rich.  The Dig-B out makes all the difference, and rereading page 29, I can
see how I missed what they meant.  The manual makes only one comparison between Dig-A out
and Dig-B out, on p.11, stating that -A "always outputs groups buses 1-8" while -B "provides
patching capability".  Not much help there at all.  I wonder how many hours I would have
wasted before trying Dig-B.  You really saved my ass there.

Now if only the 168RC's limiter effects actually worked (they're anemic at best) I'd be 100%
happy with this amazing mixer!