Hello John

> But can the A-185 control 4 VCO's and 3 ENV's accurately all on one row (If they fit on 1 row that is, not worked that out yet).

Yes. That is what this module is made for. See description:
"In general the A-185 is recommended as soon as more than 2 VCO's
(A-110, A-111) are controlled by the same control voltage source.
Without interconnection of the A-185 in this case tuning inaccuracies
(scale) may occur. The A-185 is [read that like: should be] mounted
close to the VCOs."

The envelopes have no trouble beeing connected to one gate bus.

Florian