Hi all, For 909 circuits look no further than... http://hardware.freepage.de/raf909/ Regards, Tony Allgood, Cumbria, UK e-mail: oakley at techrepairs.freeserve.co.uk Rack mounted Moog VCF module. Details to be found at... http://aupe.phys.andrews.edu/diy_archive/schematics/effects/filter.html