24 db/oct filter schematic

[jh]

>> Anyway, I'm sure that the design you have chosen make the resonance >peak less narrow. Maybe the best solution would be to use four identical >capacitors but use two exponential converters, each connected to two stages. >Then you could voltage control the spread of the poles. Might be worth a try, >while you're at it.
>
>That's an interesting idea.  Perhaps use one CV as a "master" for both
>converters, then use another as an "offset", connected to one converter?
>I'll experiment with it over the weekend if possible.  Has anyone else
>on the list tried something like this?
>
>-Chris

A similar thing. Built a 6-stage polygon filter (not SVF) with 6 13700 stages,
and one overall feedback loop. Each filter stage had its own expo transistor,
and there were two CV input adders, one would shift all stages by the
same amount, and the other one would spread the poles. (simply a 1/N*R
resistor to the expo transistor of the Nth stage.)

JH.