Buchla Q: Noisy & Quiet Ground

[Romeo Fahl]

I've been going over some 200 series Buchla schematics and have noticed that
most modules that use Vactrols have a "Quiet" ground in the audio path and a
"Noisy" ground in the CV section.  I'm guessing this has something to do
with the Vactrols, which are supposed to isolate the control voltages from
the audio path very well....  How are the two grounds related?  Are they
kept separate by low value resistors?  I would assume that they terminate in
the same area of the power supply, but that's probably oversimplified.  If I
were to build a Lo-Pass gate for example, would I get in trouble if I simply
ran both grounds together?  Can one of you experts clarify this for me?

Romeo