Documentation for the OWL family of devices

View the Project on GitHub RebelTechnology/OpenWareLab

Genius Eurorack Signal Processor

We are proud to present you with your very own Genius Eurorack module, and we hope you will find it as exciting and fun to use as we do!

What’s In the Box

Getting Started

Install the Genius in a Eurorack compatible case with +12V and -12V power supply. Connect the Eurorack power cable to your bus board, making sure that the red stripe on the cable is aligned with the -12V supply.

Power up your rack. The Genius will start up and the screen will come to life. You do not need to connect the USB cable to use the Genius.

By default the Lorenz Attractor patch is loaded on startup. Use the encoder knobs to change parameter settings; press and turn to select parameters.


The Genius has six input minijacks on the left, and six outputs on the right. From top to bottom, the inputs and outputs are:

Below the two encoders there are two TRS MIDI Type A minijack connections: input on the left, output on the right. To connect to a MIDI device with a DIN-5 connector, please use the bundled adaptor.

Below the MIDI jacks there is a USB Device connector, for connecting the Genius to a computer, tablet or smartphone. Finally at the bottom you will find the USB Host connector, for connecting USB MIDI devices, such as MIDI keyboards and MIDI controllers.

Configuration Mode

Configuration Mode is used to select a patch and to adjust system settings. To enter Configuration Mode, ‘click’ the top encoder by pressing and releasing it in quick succession. The Status page will then be displayed, showing current CPU load, firmware version and available storage space. Turn the top encoder to navigate between configuration pages. Turn the bottom encoder to change values or navigate on the page.

To exit Configuration Mode, simply press either encoder.

Changing Patches

You can easily switch to another patch stored on the device by first entering Configuration Mode and then turning the bottom encoder to select a patch. To confirm the selection, press the bottom encoder. Patches can also be selected by MIDI with a Program Change message, for example PC 2 will select the patch in slot number two.

By default, when switching on the device it will start the patch in slot number one.

Assigning CV Inputs and Outputs

The A and B CVs are freely assignable to any patch parameter. By default, they will be assigned to the first free input or output parameter. To reassign, ‘click’ the bottom encoder by quickly pressing and releasing it. To select which CV to assign (A or B, input or output), turn the top encoder. To select which parameter to assign to, turn the bottom encoder. Press either encoder to leave the assignment mode.

Changing Volume

To change the output volume, first enter Configuration Mode, then adjust the volume by turning the bottom encoder. The volume can also be changed by a MIDI Volume message (Control Change 7). For example, CC 7 127 will set the maximum volume.

USB Audio

When you connect the Genius with the USB cable to a computer, tablet or smartphone it will appear as an audio interface. It is class compliant and does not require drivers to be installed. The Genius audio interface is bidirectional and can be used to record and playback. The sample rate is 48k Hz and data width is 16 bits stereo.

Loading Patches

The online patch library has hundreds of patches to try out. To load a patch, connect the pedal with the USB cable to a computer, tablet or smartphone. It will appear as a class compliant MIDI interface. Use a Web MIDI enabled browser, such as Chrome, Chromium, or a recent version of Edge.

Go to our website at and click on PATCHES. Click on a patch, select the DEVICE subtab and click CONNECT TO DEVICE, then LOAD to upload the patch to the device. The patch will now run from RAM and you can try it out.

Read the patch details for instructions and details on the patch parameters. All parameters can be controlled by MIDI as well as the assignable encoders and CVs. Some patches may be designed for other devices and may not work that well on Genius.

To store a patch in a slot on the device, click STORE and select the slot number. To see which patches are currently stored on your device, click on the Device tab. Storing into a slot that already has a patch will overwrite that patch.

Creating Patches

It is easy to make your own patches, and you can use any of our supported languages: Pure Data, Max gen~, FAUST, SOUL, C++ or Maximilian. You don’t need to download a compiler, just click My Patches (create a free account if necessary), then click Create patch and upload your patch files. There are tutorials on many aspects of patch development available on our website (menubar TUTORIALS). Make sure to also have a look at our documentation site: And there are plenty of examples in the patch library to get you started!

Support and Community

To get updates, patches and to join our online OWL community please visit the website: For development documentation, please visit the documentation website: For support, email us: info at rebeltech dot org

Have a lot of fun! Martin Klang and the Rebel Technology team

Default Patches

Your Genius comes with a small selection of factory installed patches to get you started.

1: Lorenz Attractor

Chaotic oscillator with 3D rotation. The projected x and y axis modulate two sine oscillators which are output on the Left and Right channels.




2: Quantum Harmonic Oscillator

The quantum harmonic oscillator is the quantum-mechanical analog of the classical harmonic oscillator, here used to generate a constantly morphing wavetable.




3: Bells

Physical model of two different church bells.




4: Djembe

Physical model of two djembe drums with a stereo reverb.




5: JP Reverb

An algorithmic stereo reverb, inspired by the lush chorused sound of certain vintage Lexicon and Alesis reverberation units. Designed to sound great with synthetic sound sources, rather than sound like a realistic space.