Versatile Unison Effect

Efx REFRACT is a stereo multi-effect with versatility at its core. Combining unison-based processing with a variety of secondary effects and modulation options. Effortlessly enrich, texturise and transform any sound, from experimental distortions to detuned harmonics.


Based on super unison architecture, Efx REFRACT delivers instantaneous size and character to your sound. Whether marking key moments or making sweeping transformations - bring any track to life with flare and multi-effect dispersion.

Effortless impact

Move from unfiltered stems to a wide and powerful sound with multiple voices. This can be particularly effective for building tension and emphasizing salient moments in a composition.

Spread your sound

Efx REFRACT’s super unison architecture duplicates the signal up to 8 stereo voices. This can be used to spread and broaden any sound, and is the method behind the magic of this versatile multi-effect.

Geometric sound design

With an animated and responsive visual interface, weave various FX combinations together for a dispersion pathway that fits your wildest imaginations. Easily select the voices, filters, Mode FX, and LFO and watch the geometry evolve, along with your sound.

Expressive presets

Efx REFRACT comes with a host of presets to convey its multi-effect capabilities. Explore unique combinations of sonic dispersion and Mode FX, from Delay and Distortion to Texture and Transition.


Efx REFRACT takes any audio source and spreads it across a dynamic and modifiable FX chain, allowing you to add energy, movement and power to your heart’s content.

The sound
of unison

Unison refers to a process of multiplication, where the same sound or note is duplicated and played in parallel.

Like a string section in an orchestra, which has a wonderfully rich sound as a result of many instruments playing at once, unison replicates this for a chorus-like effect; with slight differences in phase leading to a sound that is more filled-out and enriched.

Efx REFRACT takes this approach of using multiple voices to enlarge and extend the width of a sound, which you can choose to do with or without the addition of powerful Mode FX.

5 FX

Choose to refract on its own, which can be used to enrich and widen a sound. Or disperse one of the powerful Mode FX, and unlock the uniquely expressive potential of Efx REFRACT.


Use the Bandpass filter for a classic attenuation effect, allowing you to create sweeping moods and muted atmospheres. Each dispersion voice will have a different Cutoff frequency centred around the ‘Cutoff’ control, creating a filtered widening effect.

Use the Comb Filter for subtle and wild metallic-like reverb textures. With a high ‘Resonance’, play with the ‘Cutoff’ and Refraction ‘Amount’ values to change the size of your reverb, and use the ‘Output LP’ filter to tame the top-end.

Use the Bitcrusher for resolution deforming effects. Adjust the voice number to explore the tonal variations of a downsampled signal - with added voices progressively increasing tonality.

For waveform warp, use the Distortion mode to add drive and gravel to your sound. Explore the refraction levels and notice how the sense of activity and chaos changes.

For surreal shimmers and atonal showers, the Harmonizer adds unique pitch and spray to the dispersed voices. Go from alien detuning with just a few voices or a cacophony of sound with the voice number turned up.


Need some quick-fire movement, variety, or texture? Efx REFRACT preset library contains everything from mix enhancements to pure chaos in motion - all you need to do is click.

Comb Drums

Granular Tape

Buzzin Top

Like A Phaser

Bandpass Breakdown

Lofi Tape Spread


The features
you need

  • DAW ready

    However you use these plugins; for the amazing tone of their reverb, for the gritty preamps, or for their incredible sound design abilities, you'll be safe in the knowledge that they are fully compatible with your setup. These plugins work with all major DAWs, and on both Windows and MacOS.

  • ASC

    Arturia Software Center lets you download, organize, and update all of your Arturia software titles in one place, as well as manage all of your licenses across multiple devices. Keep it simple.

  • Resizable GUI

    Whether you want the full visual immersion of our classic effects emulations, or to save precious screen real estate, the interfaces for all of your Arturia plugins can be resized to a scale that suits you.

  • Real-time control

    Every parameter in every FX Collection plugin can be mapped to your favorite MIDI controller for instant, hands-on control of your mix. Sweep a filter, crank a preamp, or warp your modulation on the fly.

  • In-App Tutorials

    Every plugin in FX Collection comes with built-in tutorials, guiding you step-by-step through the crucial parameters, adjustments, and mixing hacks to get the most out of your sound. The tutorial panel also explains the controls you’re using in real-time - so you’ll never miss a tweak.

  • Preset browser

    FX Collection’s streamlined preset browser lets you filter, organize, and save your favorite presets for instant recall. Search by instrument type, genre, production technique, and much more - so you can quickly find the tweak you need and save valuable creative time!


Main Features

Super Unison refraction engine with up to 8 stereo voices

Dynamic and responsive user interface with real-time 3D graphics

5 Mode FX to choose from, each with specific controls, for a wide range of creative results

  • Bandpass
  • Comb Filter
  • Bitcrusher
  • Distortion
  • Harmonizer

4 Distortion Algorithms

12 Harmonizer Chords

Simple control scheme that represents complex multi-parameter mapping and unique dispersion effect

Input and output filters

Pre-configured LFO with synced rates

47 built-in presets

A/B Comparison

Platforms specifications


  • Win 10+ (64bit)
  • 4 GB RAM
  • 4 cores CPU, 3.4 GHz (4.0 GHz Turbo-boost)
  • 1GB free hard disk space
  • OpenGL 2.0 compatible GPU
  • ARM processors not supported on Windows

Required configuration

  • VST, AAX, Audio Unit, NKS (64-bit DAWs only).


  • Mac OS 10.13+
  • 4 GB RAM
  • 4 cores CPU, 3.4 GHz (4.0 GHz Turbo-boost) or M1 CPU
  • 1GB free hard disk space
  • OpenGL 2.0 compatible GPU

Work with ASC

  • An elegant and simple solution to help you install, activate, and update your Arturia software.

* All manufacturer and product names mentioned on this page are trademarks of their respective owners, which are in no way associated or affiliated with Arturia. The trademarks of other manufacturers are used solely to identify the products of those manufacturers whose features and sound were studied during the development. All names of equipment, inventors, and manufacturers have been included for illustrative and educational purposes only, and do not suggest any affiliation or endorsement by any equipment inventor or manufacturer.

*NKS ready