Befaco Oneiroi Eurorack Experimental Soundscape Eurorack Module


A full-stereo synth voice for eurorack that easily creates dense atmospheres for hypnotic music or cinematic sound design. 

Functions: Delay , Effect , Filter , Resonator , Reverb , Synth Voice
Height: 3U
Width: 30hp
Out of stock
Availability: Pre-order | Free UK Shipping

Oneiroi is a live performance-oriented, multi-functional self-contained experimental digital synth focused on ambient pads and drone-like soundscapes.

It features a full stereo signal path: Stereo input, 2 oscillators , 4 effects, and a looper. It also includes LFO self-modulation and a randomizer. Oneiroi is based on Rebel Technology’s OWL platform.


  • Powered by the latest OWL revision (mk3), with 24-bit 48 kHz stereo audio (32-bit internal processing)
  • Stereo input with three switchable gain levels and a two-coloured LED for monitoring
  • Stereo output
  • 5-second looper with continuous speed control (from 2x in reverse direction to 2x in forward direction) and pre and post looping selector.
  • Sine oscillator
  • Stereo Supersaw oscillator with detune control, inspired by the JP-8000
  • 2048-sample dynamic wavetable oscillator (aliased) that uses the looper buffer, with offset control
  • Single v/oct input for the three oscillators and unison control
  • Filtering unit with four different types: low-pass, band-pass, high-pass, and comb filter. The filter can be freely positioned along the effects chain
  • 3-band resonator with tune and feedback controls
  • A 2-tap echo with controls over time and density
  • Reverb with macro control for size, filtering, and direction
  • Eight short-throw faders for controlling volumes (exponential) and effects amount (constant power), with relative CV inputs
  • Eight CV controls for the primary parameters, four of them can be dynamically assigned to the secondary ones as well
  • Possibility to record either the stereo input or the module’s output
  • Various types of self-modulation with configurable routing and control over level and speed
  • External synchronization via sync input (supported clock speed from 30 BPM to 300 BPM)
  • Powerful randomizer with four different targets, three levels of intensity and undo/redo
  • Soft take-over functionality for re-coupling parameters’ positions and values after randomization, with LEDs for showing where the value is in relation to the position of the control.


30 HP
25 mm deep

Current Draw

200 mA +12V
60 mA -12V
0 mA 5V

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Befaco Oneiroi Eurorack Experimental Soundscape Eurorack Module