Hi Sven, > Somewhere i read about the Polivoks, a russian synth, and it's filter. > Could someone please point me to a schematic of this filter?? I have those. The polyvox is in essence a clone of the moog prodigy IIRC. I've posted them here: http://www.uni-bonn.de/~uzs159/polivoks/index.html Cheers, René -- uzs159 at uni-bonn.de http://www.uni-bonn.de/~uzs159