Fairfield Circuitry Long Life Parametric EQ

A state-variable filter with wide range and application. Versatile. Combining tilt and notch/boost equalization around a 2nd-order (-12dB/octave) state-variable core.

Very much a one-band parametric equalizer with gritty extras:

• Shelving filter, from low-pass to high-pass


• CV inputs for resonance (Q) and frequency (F)


• V/octave scaling synthesizer interface


• Fully variable Q goes well into tasty sweet self-oscillations


• Soft clip zener zesty mordant


• Expression pedal input controls center frequency