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Synth by Future Audio Workshop

Circle² is the new major update to Future Audio Workshop’s flagship software synthesizer, Circle. Since its release in 2009, Circle has achieved cult status, becoming a key tool in the arsenal of both seminal underground and pop hitmakers such as Hudson Mohawke, Arca, David Guetta and Deadmau5. The 2015 update incorporates several new features, modules and effects, extending the spectrum of sounds that can be composed. Circle² also features a completely redesigned user interface, providing a forward-thinking interpretation of Circle's esteemed user-centred design approach.

Usability is at the heart of the design of Circle². With the affordance of the power of modern computer processors, many software synthesizers have become progressively more complex and difficult to use. The aim of Circle is to step aside from this path, and to instead focus on placing flow and intuitiveness at the core of the music making process. Rather than burying a deluge of synthesis parameters in submenus and external windows, Circle² encourages experimentation by presenting parameters in an accessible and intuitive manner.

The unique Circle² interface enables a level of experimentation that would be unachievable via a more typical, convoluted interface; allowing the user to focus on creativity rather than technicalities. This design philosophy sets Circle² apart in the synthesizer landscape and provides the foundation for the development of the next generation. Instead of designing Circle² to graphically replicate its analog predecessors, Future Audio Workshop have been working alongside Berlin-based designer Lars Hammerschmidt to bring Circle² firmly into the 21st century through the use of a contemporary design language that looks more to the future than the past. The goal was to construct an even flatter design with brighter, more distinct colors than was seen in Circle.

New Synthesis Type: VPS

Based on state-of-the-art digital synthesis research, the brand new VPS (vector phaseshaping synthesis) oscillator is one of the most exciting new features of Circle². The new oscillator utilizes a cutting-edge synthesis technique introduced by researchers at the Aalto University School of Electrical Engineering and The National University of Ireland, and further developed for its implementation in Circle² via an academic collaboration with Future Audio Workshop. 

The VPS oscillator works by glueing together a pair of sine waves with specified frequencies. Via its two parameters - which control the frequencies of the sine waves and the location at which they are glued - the VPS oscillator provides direct control of the waveform’s intricate harmonics. Experimentation throughout the oscillator development process has led to a range of results; from dirty Reese style bass patches to ethereal pads and gritty lead lines. Modulating the parameters can produce a wide range of effects, either used subtly to give gentle movement, or used harshly to twist and contort a synth into oblivion. We’re excited to hear what synthesis results users can achieve using the new oscillator.

Fully Re-Written Audio Engine

Circle² provides several enhancements to Circle's instantly recognizable and critically acclaimed sound engine, helping to ensure that Circle² sounds better than ever before. Furthermore, on top of Circle’s existing modules, Circle² also comes with new Bucket Delay and Tube Distortion effects that bring a vintage flavour to its sounds. This gives Circle² a new total of 15 inbuilt sound modifiers / effects.

Retina Ready​

Circle²'s interface is fully retina display ready. Brings a vibrancy and clarity that is unseen in other software instruments. An interface for 2015.

Design Sounds Visually

Simply move the colour-coded circles around the interface to start creating your own unique sounds. Preview a connection by hovering a circle beneath a knob. Explore sound in an intuitive way.

Redesigned Interface, Improved Workflows

Taking the key concepts of the first version, we have improved the workflow and user experience in Circle². Find the required sounds effortlessly using our new preset browers.

Module List:

  • Sound Sources - Analog Oscillator, Wavetable Oscillator, VPS Oscillator, Noise, Feedback
  • Dedicated ModulatorsADSR Envelope, LFO, Sequencer, Arpeggiator
  • Sound ModifiersMixer, Mouth Filter, Fuzz Distortion, Overdrive, Parametric EQ, Shelving EQ, Phaser Filter, Crusher, Ring Modulator, Filter, Dual Filter, VCA
  • Master EffectsPhaser, Reverb, Echo, Double Echo, Ping Pong Echo, Chorus, Panner, Bucket Delay, Tube Distortion


  • Unique to Circle², the VPS is new type of oscillator, the outcome of a research
  • partnership between FAW and Maynooth University.
  • Totally redesigned interface. Retina ready and optimised for creative flow.
  • New Bucket Delay and Tube distortion modules.
  • Improved preset management via the new preset browser.
  • Performance enhancements and improved sound via a totally rewritten audio engine.
  • Utilizes the latest version of JUCE audio framework, resulting in a more stable and future proofed Circle².
  • Now official support for Reaper, Studio One and Bitwig Studio.
  • New factory preset bank, full of future leaning sounds, ready for use in your music.
  • Full 64bit and 32bit support, both on Windows and OSX.

Below are some of the artists and labels we are currently working with or who use Circle2 in their music:

  • Arca
  • Hudson Mohawke
  • Richard Devine
  • Rustie
  • Mark Pritchard
  • Mike Huckaby
  • Jimmy Edgar
  • Efdemin
  • Monty Luke
  • Deadmau5
  • David Guetta
  • Sandy Vee
  • John Tejada

System Requirements


  • Works as Standalone, Audio Unit, VST and AAX


  • OS X 10.7 or higher
  • Intel® Core™ Duo 1.66 GHz, 768 MB RAM


  • Windows XP or higher
  • Pentium/Athlon XP 1.4 GHz, 512 MB RAM

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