The Frostwave Resonator is a direct homage to one of the most revered filter designs in synthesizer history, pulling its architecture straight from the Korg MS-20's legendary dual-filter topology. Released in the early 2000s as a standalone desktop module, it captures that particular flavor of aggressive, self-oscillating character that made the MS-20 such a powerhouse for sculptural sound design.
The unit pairs a high-pass and low-pass filter in series, each with independent cutoff frequency and resonance controls. You get four main knobs handling those parameters, plus a volume knob and wet/dry mix control to blend the filtered signal with your dry input. The resonance on both filters can push into self-oscillation territory, turning the Resonator into a sound source of its own when you crank it up. Six 1/4-inch connections handle audio in and out, and CV/gate inputs let you modulate the filters from an external sequencer or control voltage source. The whole thing sits in a compact desktop format finished in blue, designed to integrate into a modular setup or work as a standalone processor.
Since discontinuation, the Resonator has developed a quiet cult following among filter enthusiasts and MS-20 devotees who appreciate its straightforward approach to voltage-controlled filtering. It's become increasingly rare on the secondhand market, which speaks to both its build quality and the fact that people who own one tend to keep it.
