Rossum Electro-Music Morpheus Stereo Morphing Z-Plane Filter

This set of videos, via Control, is an overview and hands-on demo of the Rossum Electro-Music Morpheus  filter.

The Morpheus Eurorack module includes over 190 filter configurations. Each configuration is composed of up to 8 complex filters that you can picture as being at the corners of a three dimensional cube. Morpheus gives you the ability to smoothly interpolate between those 8 filters within the cube’s three dimensional space.

The original Morpheus was capable of real-time morphing in one dimension, but interpolation in the frequency and transform dimensions were set at note-on and remained static for the remainder of the note. With the Morpheus filter module, you now have simultaneous real-time CV control of all three dimensions, for dynamic timbral effects unlike anything you’ve ever heard before, and in stereo.


  • Over 190 14-pole filter configurations
  • Real-time manual and CV control of Frequency, Morphing and Transformation
  • The ability to save hundreds of customized filter configurations
  • A sequencer for stepping through filter configurations under trigger or clock control
  • A large OLED display for programming and realtime display of morphing
  • All parameters are available for adjustment with a single button press. No menu diving.

Pricing and Availability

The Rossum Electro-Music Morpheus filter is available now for US $499. See the Rossum Electro-Music site for more info.

17 thoughts on “Rossum Electro-Music Morpheus Stereo Morphing Z-Plane Filter

  1. Rossum Electro Music – as the function / operation of this is mostly done by DSP with analog I/O,
    Please also develop a VST plugin version, with MIDI-CC (Continuous Controller) of the various parameters.


    1. I’ve gotten into Eurorack and am thinking about more filters… but I agree, this design cries out for a nice big GUI and it’s kind of unappealing as a module tbh.

  2. Videos need more “this is what a few different cubes sound like with a sawtooth”, less “lots of stuff going on in the audio that doesn’t match the random garbage going on in the video.”

    1. The audio you hear in the videos is filmed live input, with the Morpheus processing in real time. So what you are hearing is not randomly selected audio put to mismatched video. In the instances where you hear a synth sound and drums, the drums were recorded through the Morpheus, then layered in. But every sound you hear was 100% processed via the Morpheus.

  3. too much talking, too complex sound source, why?
    Feed it with a nice analog synth sequence and turn the knobs while we watch and listen to the results….
    It sounds promising, but the video’s do not illustrate this.

  4. Does the 3D cube thing have any significance at all? It could just as well be any eight sided shape. No? Or just a list for that matter. Still an awesome filter though. What would be totally savage is if it could process both L and R channels individually with different filters

    1. The idea with the cube is you have a different filter configuration at each corner, and then every point within the cube is some combination of those 8 configurations. Your three modulations correspond to the three dimensions of the cube. So thinking of it as a cube tells you which things you’re sweeping between when you sweep one of those modulations.

  5. Being eurorack (analog in > analog out) with a DSP brain core, what are the resolutions and bit-depths of the ADC & DAC ?

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