This dual resonator/filter dubbed Dubernator/Duber/Deebernader whatever you want to call it, comes from Peter B the creator of awesome instruments meant to blow your mind, seen here http://www.ciat-lonbarde.net/.
Actually I have never seen anyone make more tripped-out circuitboard layouts then this guy things layout every which way except strait. The most awesome part about the Doober is that you can build one yourself given that Peter Graciously provides the schematics and construction manuals on his site, however if you are too busy working a real job you can also purchase one assembled for $220. That is cleap IMO considering some people spend twice that much for 555 oscillator driven magic boxes. Duber Link: