More Nonlinear

[Eric Barbour]

>Perhaps something like a starved tube in the feedback path where
>the starvation is voltage controlled.

This would be a perfect application for my pentode VCA........

>Or would something like this just oscillate wildly or go 
>randomly chaotic too easily?

Depends on the loop gain and pole-zero layout. A peak or 180
deg phase shift at any frequency (other than the desired Fo)
would tend to be unstable and oscillate at that freq.

It's a problem when you have capacitive
coupling between multiple stages in state-variable or biquad filters. If there
was only one stage with C coupling, it will probably not happen.

Besides, maybe it would be an interesting effect........

Eric Barbour
Svetlana Electron Devices