JoMoX M-Resonator Stereo Analog Dual Filter Envelope Follower FM Synth Effects SN 0589

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via this auction

via the seller: "A unique analog filter effects box from JoMoX, which is no longer in production. Similar to the T-Resonator without the delay effects and has a unique character of it's own as I have owned both.

If you're looking for a more straight ahead filter without the added zaniness that the delay lines add to the T-Resonator, this unit would complement the T and serve as a nice Moog-ish filter module to add some depth, character, and warmth to your sounds (digital synths, drum machines, guitar, etc.). Unit is in very nice shape and works as it should."

Product description:
"The m-resonator is a small filter box based on the resonator neuronium. the m-resonator has a true differential envelope follower and 2 filters that can be fed back in every way plus the filter distorts smoothly.

This little and inexpensive filter box is just incredible, although you won't see what's inside at first.

The envelope follower is level independent and has 2 actual envelopes internally - one fixed and one changeable referential envelope. They both are divided analog which produces a level independent envelope within far ranges.

The filters are made from discreet parts and form a 24 pole lowpass filter transistor cascade.
They can - in any thinkable way - be self feedbacked and be coupled or feedbacked with each other, so that extreme sounds and chaotic states create - all what you need today for creative analog sound design.
Unbelievable bass gains or screaming scratch sounds are no problem.
The mix pots are zeroed in center position; any other angle will couple or feedback negatively or positively. FM in both directions is also available.

Connections: Power 9V~ AC, Stereo In 2x 1/4 inch, Stereo Out 2x 1/4 inch"