[sdiy] Filter problems

[Tim Ressel]

Hi,

Filters can be a pain. I've got one that is misbehaving. Here is a link 
to the schematic:

https://www.dropbox.com/s/acjvwb17nmuok1n/PrismFilter.pdf?dl=0

At low CVs it filters fine, but as the freq cv hits around 2 volts the 
behavior gets odd. I start seeing a rising DC bias on all the outputs. 
At about 3 volts all the outputs rail positive.

Any help is appreciated. Thanks for playing!

-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com