rossum-electro/morpheus

Morpheus

Rossum Electro-Music

Stereo Morphing Z-Plane Filter with 289 filter Cubes, each composed of up to 8 complex frequency response configurations interpolated in three dimensions (Frequency, Morph, Transform) via real-time CV control.357

Capabilities 4

Multimode Filtermultimode-filter
289 factory filter Cubes spanning flangers, diphthong/vowel filters, standard LP/HP/BP, equalization, complex, tracking, harmonic, and distortion responses — all with real-time 3D interpolation.357
Stereo Processingstereo-processing
True stereo audio inputs and outputs; left and right channels processed by the same filter but with independent Gain and Distortion parameters per channel.357
Vcfvcf
357
Z-Plane Filterz-plane-filter
Each Cube is a named 14-pole Z-Plane configuration with up to 8 complex frequency responses at the cube corners, interpolated in real-time via three CV-controlled axes.357

Jacks 11 (9 in / 2 out)

NameSignalVoltageDescription
Inputs (9)
Audio In Leftaudio—357
Audio In Rightaudio—357
Freq CVcv—Attenuverter-modified CV input summed with Frequency knob and Full Level CV to produce the final Frequency control value.357
Full Levelcv—Unattenuated CV input summed with the Frequency knob and Freq CV to produce the final Frequency control value.357
Morph CVcv—Attenuverter-modified CV input summed with Morph knob to produce the final Morph control value.357
Sequencer Dectrigger—357
Sequencer Inctrigger≥1.65V357
Sequencer Resettrigger—357
Trans CVcv—Attenuverter-modified CV input summed with Transform knob to control Transform axis interpolation or, optionally, distortion amount, depending on per-filter setting.357
Outputs (2)
Audio Out Leftaudio—357
Audio Out Rightaudio—357

Parameters 13

NameTypeRangeBehavior
CV Gainmenu_setting-9.9 – 9.9Scales the cumulative CV (knob + CV inputs) for each axis. Values >1 increase CV; values 0.01–0.99 decrease CV; negative values scale and invert.357
Frequencyknob-5V – 5VSets the Frequency axis interpolation point. Summed with Freq CV and Full Level CV inputs. Controls filter cutoff/frequency in most cubes.357
Frequency Attenuverterknob—Scales and optionally inverts the Freq CV input. At 0, no CV passes. Clockwise increases amplitude up to full at max. Counter-clockwise inverts and scales up to full inverted amplitude at max CCW.357
Left Distortionmenu_setting-30dB – 70dB357
Left Gainmenu_setting—Sets the gain from input to output for the left channel. Displayed on the left channel output meter. Does not affect internal distortion amount.357
Morphknob-5V – 5VSets the Morph axis interpolation point. Summed with Morph CV input. Controls morphing dimension in all cubes.357
Morph Attenuverterknob—357
Right Distortionmenu_setting-30dB – 70dB357
Right Gainmenu_setting—357
Select Cubemenu_setting—Selects which of the 289 Cubes the filter uses. Cube 000 is the Null Cube (bypass).357
Transformknob-5V – 5VSets the Transform axis interpolation point or, when Transform Controls Distortion is ON, controls distortion amount. Summed with Trans CV input.357
Transform Attenuverterknob—357
Transform Controls Distortionmenu_setting—When OFF, Transform controls the Transform axis interpolation point. When ON, Transform controls distortion amount and Transform CV Offset sets the static Transform axis position.357

Firmware history 2 versions

VersionReleasedNotes
1.01vc_170120—Fixes an error in the Null Cube where gain at cube corners with Frequency and Transform CVs at -5V and Morph at either -5V or +5V was +12dB rather than the intended 0dB. All other cubes unaffected.357
1.00v_170111—357

References 2

  1. [357]
    Rossum Morpheus User Guidemanual
    source 357 canonical ↗ archived ↗
    ● verified 2026-05-15
  2. [358]
    Rossum Electro-Music Morpheus product pageproduct_page
    source 358 canonical ↗ archived ↗
    ⚠ verified 2026-05-15 · manufacturer changed since last verified