Hi, I have just been to the below site as requested... http://www.mcs.net/~maf/html/wiard.html Now I am really jealous. Just look at that Digisound....drool Regards, Tony Allgood, Cumbria, UK e-mail: oakley at enterprise.net Rack mounted Moog VCF module. Details to be found at... http://aupe.phys.andrews.edu/diy_archive/schematics/effects/filter.html