Clone of the Holmes H-X6 Spectrum filter pedal (The whaaaaat??). These were also sold under the Coron, Asama, and Sanox labels. Household names in the pedal industry, we know. Another fantastically handy, yet obscure Japanese circuit. This is a tone shaper. 3 band EQ, with added HP and BP filtering, and a resonance control added in for good measure. Use it at the beginning of the chain to set the tone, or after a particular pedal to shape it's sound. If you're looking for the perfect cocked wah sound, it'll do that too. One of the nicest circuits that no one has heard of.