In this release we fixed the problem with the resonator emitting unwanted peaks in certain frequencies:
https://github.com/Befaco/Oneiroi/issues/38
We also raised a little the resonator's maximum feedback so it's now able to self oscillate without input.
Last checked 27 Oct 2026
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The update replaces the Oneiroi patch (the sound engine) in the browser with OWL Web Control. Your calibration is kept. 1. Download patch.syx from the Assets of the GitHub release linked above (Download firmware). 2. Power the module in your case and connect it to your computer with a USB cable on the back. 3. Open OWL Web Control (the updater linked above) in Chrome or Chromium and allow MIDI access. 4. Check that the page says "Connected to Oneiroi". 5. Click Choose file, select patch.syx, press Store and accept slot 1. The number on that page is the module firmware, not the patch: to see the installed patch version, connect the module at rebeltech.org/patch-library/device and look under "loaded patch". Coming from a patch older than 1.2? First follow the steps in the v1.2 GitHub release: it also updates the module firmware (OWL Web Control firmware page) and asks you to delete the old oneiroi.cfg.
What you need
OWL Web Control — the software Befaco uses to load firmware onto the Befaco Oneiroi. Download links below.
This fixes these two issues:
- fixed looper's start and length knobs that stop working when speed = 0 (https://github.com/Befaco/Oneiroi/issues/50)
- removed LED indication of patch version (https://github.com/Befaco/Oneiroi/issues/48)
To check the patch version, connect your unit here https://www.rebeltech.org/patch-library/device/, the version will be shown under "loaded patch".
- Fixed modulation and CV mappings when using attenuverters (#2)
- Fixed looper's backwards playback (#3)
- New crossfade for looper's loop point (#4)
- Fixed sine osc frequency boundaries (#6)
- Raised looper's crossfading time / Fixed crossfading when going backwards (#11)
- Fixed wavetable pitch jittery
- Smoothed wavetable offset
- Improved wavetable sound by passing it through a fixed low shelf filter
- Fixed sine waves unison (#12)
- Fixed wavetable offset CV (#16)
- Removed a bit of lag from oscillators pitch control and V/OCT input
- Tweaked the oscillators' levels (#17)
- Swapped biquad filters for SVF in DjFilter to save some CPU, especially when looper is recording
- Added fade in/out when starting/stopping recording to avoid clicks
- Smoothed echo's density (#9)
- Raised looper's start parameter resolution
- Added DC blocking filters at the beginning and at the end of the audio chain to reduce low end rumble
- A bit of gain to DjFilter's extremes
- Better fade when looper is triggered
- Fixed clicking of echo's density when synced
- Added compressors to echo and ambience
- Displaying patch version with LEDs
- Fixed ambience's reverse spacetime
What is the latest firmware for the Befaco Oneiroi?
The latest firmware for the Befaco Oneiroi is version 1.2.2, released on 6 Nov 2025. FW//RADAR last checked Befaco's official page on 27 Oct 2026.
How do I update the Befaco Oneiroi?
The update replaces the Oneiroi patch (the sound engine) in the browser with OWL Web Control. Your calibration is kept. Full instructions on Befaco's official firmware page.
What software do I need to update the Befaco Oneiroi?
You need OWL Web Control, available from pingdynasty.github.io.
Where can I download Befaco Oneiroi firmware and drivers?
Directly from Befaco's official firmware page — FW//RADAR links to the source and never hosts firmware files. Official firmware page →
