Hi everyone, about a month ago I posted that my reverse-sawtooth vco wouldn't run below 96 hz. the fix was to add some hysteresis to the comparator by adding a 10k resistor between the non-inverting and inverting pins, and placing a 0.1uf capacitor across the jfet. the circuit now can oscillate between 16hz to 2900hz, which is a good range for the purpose i'm going to be using it for, an analog polyphonic synthesizer. The only problem that i'm having with it at the moment is that the voltage-controlled current sink is not responding fast enough to control voltage changes. I have tried adding resistors and capacitors in the negative feedback loop, but the circuit still doesn't respond fast enough. I will attach the Revision 2 schematic (in pdf form) below. any suggestions on how to improve the responsiveness of the voltage controlled current sink would be greatly appreciated.