multimode filter

b:16 is a multimode filter in 2HP. It delivers three simultaneous filter outputs - highpass, bandpass, and lowpass - from a single audio input, with independent knob control over cutoff and resonance, plus CV inputs for both. The OTA-based state-variable topology covers the full audible range from 30Hz to 20kHz, self-oscillates at high resonance, and responds naturally to bipolar CV modulation.

https://bartinstruments.com/products/b-16