That is one of the coolest VCO features I've ever seen! Brilliant work, Grant, once again. -- john ----- Original Message ----- From: "Grant Richter" <grichter at asapnet.net> > > The VCO for the Terrain module replaces the analog comparator with a > 20 MSPS video A/D. > ... > The advantage is that you have simultaneous analog and digital > sawtooth outputs.