Doepfer

A while back there was some discussion
on vactrol based modules.  I believe
the thoughts were that vactrols in the
audio path are not that sonically exciting.
Looking at buchla schematics I find that
vactrols are used quite often to isolate
the control path from the audio path 
(optoisolator?) I understand the ultra-smooth
response of vactrols make a modules response
to CV something special.  I wonder if the
design folks over at doepfer have considered 
this?

Ethan