Karl Dalen pointed out to me that some folks on this list might be interested in Synergy schematics. In case you have a wild urge to build a digital oscillator out of 70s parts, go to: http://users.ece.gatech.edu/~lanterma/synergy/ and scroll down to the schematics link. These are courtesy Mark Glinsky (who sold me his Synergy II+) - Aaron