> I want to do a board layout for Barry Kleins CEM3320 Lowpass VCF circuit
> (fig.5-20 in the book) from Electronic Music Circuits. It will end up a
> lowpass similar in sound and features to the 440
You won't.
Or more precisely, you might - if you always run it at signal levels where
nonlinearities are not important. Which is a small subset of interesting
applications.
You will come be able to emulate a Pro-1 filter, of course. But you won't
come close to a MOTM-440 - not closer than a revision 3 Prophet comes
to a rev. 2.
> This is the classic filter from the sequential
> Pro-1/Oberheim misc and has the bass compensation when resonance is
> increased like the 440 (but on chip)
"Bass compensation" is just what's going on "on the outside". The similar
bass compensation has very different sonic qualities on a SSM "chip",
a CEM chip. (Or on a Roland chip for that matter. The Juno-6 has a similar
thing as well, but a filter circuit different to both SSM and CEM.)
JH.