Wiardgroup

I don't know if I mentioned this before.

If you run the pulse output of one VCO (master) to the synch input of another (slave synch 
knob to max) tuned in unison, then PWM on the first VCO should shift the phase of the 
second against the first.

Adding the outputs together should give a rich chorusing sound if the PWM of the "master" 
VCO is modulated by an LFO.

This was a mod Ron Rivera invented for the ARP 2600.