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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