The NEUTRON Paraphonic Analog and Semi-Modular Synthesizer by Behringer features VCO's from the legendary 3340's, but amended with new circuitry. In fact, the filter is a complete new design. Behringer calls it the Moffatt filter, named after design engineer Keith Moffatt at their Manchester Innovation center. Keith has been experimenting for years with new synth and in particular filter designs. The Moffatt filter is a great contribution to, and just one of the many innovative features you will find in the Neutron.