Modular Synth Panels

This thread has a bunch of ideas including my 2-parts count passive VCF:

http://electro-music.com/forum/viewtopic.php?t=26643

--- In ModularSynthPanels@yahoogroups.com, "wjhall11" <wjhall@...> wrote:
>
> OK, we're biting <G> - where do we learn about these passive circuits?
> Bill and Will