> P.S. Anyone know of any schematics online for other switched capacitor filters > or phasers? I think the ADA Final Phase used a switched capacitor design. There are I think two such circuits at Anders Sponton's old site http://www.tellus.vallentuna.se/gymninfo/personal/anders/andersus.html in files that contain ETI/MAPLIN 4600/5700 synths. marjan