Using an Echophon, Dr. Octature and Noisering to create a voltage-controlled feedback system similar to a no-input mixing channel.
Doc Oc is patched into the Echophon's external feedback loop. The Noisering's 1 and 2 outs are patched to the 1v/oct* and Q CV ins on the Octature. A high enough resonance will cause the filter to oscillate. The recirculating echos give the whole thing a nice ghostly quality.
This is a handy patch to have on hand if you ever find yourself having to do background music for a late night, Creature Feature type show on public access.
*Maths is acting as a slew limiter between Noisering out 1 and Doc Oc 1v/oct in.