[sdiy] Multimode filter topology

[David G. Dixon]

Thanks, George.  Very elegant design!

> This topic was discussed at some length a few months ago under the thread
> "XPander VCF" I think.  One thing I found when trying out multimode
> filters
> was that you can't quite get the stop band attenuation in the HP and BP
> modes you might like due to component variations.
> I've built an implementation of a multimode VCF constructed from an
> SSM2040
> (equivalent).  The schematics are at
> http://sites.google.com/site/hearnmorley/synth-diy-resources