Hi olli

via http://matrixsynth.blogspot.com/2010/12/diy-digital-synth-demo.html
I stumbled over http://www.national.com/mpf/MF/MF10.html#Overview

Needs a clock instead of CV, but a simple VCO (no extreme linearity is
required for this kind of VCF) shouldn't be too difficult.

I think it would be also extremely useful as anti aliasing filter for
the BBD modules.

Florian