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