>I need suggestions for a simple VCO circuit. V/oct. The TB303 VCO is dead simple and stable enough for most people. Schematics are at many places, but you can also see one at the URL below. Regards, Tony Allgood, Cumbria, UK Rack mounted moog filter and the TB3030 SuperBassline projects: http://aupe.phys.andrews.edu/diy_archive/schematics/oakley/