3 Channel Formant Filter
https://www.groveaudio.com/pmreso_eu.html
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Grove Audio PM ResonatorThe PM Resonator is a recreation of the formant filter section of a Polymoog™ synthesizer in an 18HP modular panel for Eurorack (EU) format synths. Each of the three filter channels has a control for frequency, signal gain, and emphasis or resonance.A rotary switch selects the type of filter mode for the three channels. The modes are low pass, band pass, band notch, and high pass.Listing includes module and power cable.

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