Holonic Systems plugins for VCV Rack and miRack

Holonic Source


The Holonic Source module for VCV Rack integrates with the Holon.ist iOS app and outputs control signals to VCV Rack.

Receiving Bus

The receiving bus selector determines from which bus the module receives signals. This allows use of multiple instances of the module in a patch, providing up to 64 channels of control.

Activity LEDs

Activity LEDs for each channel indicate when Holonic Source receives OSC messages for the particular channel and receiving bus.


For the scaling of values.

Low Pass Filters

An adjustable slew is included to smooth signals as desired.


VCV rack expects values between 0v and +10v for unipolar and between -5v and +5v for bipolar signals.

Holonic Source clips signals to -10v, +10v.

Ensure that values are properly scaled in the Holon.ist scaling section.

OSC Communication

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mDNS/bonjour is used for autodiscovery.

  • MacOS
    • Holon.ist automatically detects VCV Rack when the Holonic Source plugin is loaded.
  • Windows
    • Requires Bonjour SDK from Apple to be installed: https://developer.apple.com/bonjour/
    • Check that the Bonjour Service is running.
    • Run the script Holonic_Source_windows.bat. This script can be found in the plugin folder c:\Users\<you>\Documents\Rack\Plugins\HolonicSystems-Free\ The script publishes Holonic Source on the network to allow autodiscovery from Holon.ist app.
    • The DOS window needs to remain open for the duration of the VCV session.
  • Linux
    • Ensure Avahi is running.
    • Run the script. Holonic_Source_linux.sh. This publishes Holonic Source on the network to allow autodiscovery./
    • The shell window needs to remain open for the duration of the VCV session.


  • Ensure that firewalls, such as Little Snitch, are not blocking communication. For instance, on MacOS, with Little Snitch firewall, incoming communication must be specifically enabled for Rack.
  • If you cannot get autodiscovery to work for some reason, you can always manually create an OSC output in Holon.ist and input your computer IP and port 9000.
  • Please read the Holon.ist manual

OSC Message Format

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The Holonic Source OSC message format is used to ensure close integration with our Holon.ist app. In order to use Holonic Source with any other OSC compatible application, please select port 9000.

The message OSC path is /<bus>/<channel>/<mode> where:

  • /<bus> is one of a/b/c/d/e/f/g/h
  • /<channel> is one of 1/2/3/4/5/6/7/8
  • /<mode> is one of cv for unipolar CV, cvbi for bipolar CV.

For instance `/a/2/cv` will address channel 2 of bus a in CV mode.

Argument value should be a float. Holonic Source accepts values in [-1,1] range or in [-10,10] range depending on the switch configuration in the GUI. When [-1,1] is selected, values will effectively be multiplied by 10.


Dumbwaiter is an addressable 8 step sequencer and switch. One could see it as the lower row of the Doepfer A-155 with a large helping of A-154 functionality.

Lazy Susan

Lazy Susan is a quad quantiser with user editable scales. For your convenience, your custom scales are saved with each patch. By default, the scales are the 7 standard modes: Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian

Serving suggestion: The Doepfer A-156 Quantiser minor mode is a melodic minor scale (CmMaj7). Choose the Dorian scale and sharpen the 7th to harmonize with your Eurorack.


Pantry is a Dual CV/Gate Recorder/Looper.


Swiss Cheese Knife

Swiss Cheese Knife is a fully featured quad utility module.

Inverts input signal.
Signal Attenuator.
Sample and Hold
Classic Sample and Hold.
VCA with variable response shape, ranging from linear to exponential.
Low Pass Filter
Simple low pass filter.
Slew Limiter
Slew limiter with independently adjustable slope shape and Rise and Fall times.
DC Offset Remover
While in AC mode, any DC offset is removed.
Signal offset.
Swiss Cheese Knife can also mix four signals, as its outputs are normalled.


Gaps is a clock divider that supports multiple modes.

Four modes are available:

Additionally, Gaps can behave in two ways:


A simple dual switch with two inputs and one output.

Two modes are available:

Demo patches

We’ve created a number of patches and templates that can be used as starting points, or just enjoyed, at: https://patchstorage.com/author/holmium/
You can use any of the included Holonist factory presets to control the patches.

Also, we've put together some VCV demo patches using the Holonic Source. They use the default mappings in the Holon.ist app.

Our demos are packaged with the plugins, they are located in:
c:\Users\<you>\Documents\Rack\Plugins\HolonicSystems-Free\demos (Windows)
/Users/<you>/Documents/Rack/plugins/HolonicSystems-Free/demos (MacOS)

Alternatively, you can download them directly from here :

The demo patches require the following VCV Rack plugins to be installed:


VCV Rack

Please check the following installation steps below to avoid common pitfalls, such as firewalls, and to ensure full functionality of the autodetection feature.


Holon.ist connects to the Holonic Source plugin ported to miRack by mifki, enabling a fully mobile setup.