3 Channel Formant Filter
The PM Resonator is a recreation of the formant filter section of a Polymoog™ synthesizer in a standard 5U double-width modular panel. 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 each of the three channels. The modes are low pass, bandpass, band notch, and high pass.
http://www.groveaudio.com/synthstore/index.php?route=product/product&path=59_65&product_id=51
No info about availability.
$219