Spitfire Audio Olafur Arnalds Stratus

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The piano reimagined

Fusing the power of technology with the organic beauty and emotion of the piano, Stratus is a vast, dynamic new instrument that will add depth, movement, and color to your music. Made in collaboration with BAFTA-winning Icelandic composer and producer Ólafur Arnalds, this versatile, multidimensional tool bends space and time through an intricate network of polyrhythmic piano performances. Awe-inspiring patterns and atmospheric clouds of harmonic refractions swell and die away at your fingertips, unfolding based on what you play and instantly sparking new ideas.

Instantly playable and easy to use, Stratus is presented in a bespoke interface made up of eight multi-layered piano and synthesizer matrixes, each offering a unique sonic experience — plus detailed customization options and mind-blowing warped sounds, offering a full spectrum of emotion.

 Compatible with NKS

Spitfire Audio App

Polyrhythmic piano

Mercury synth

Kontakt Player





Ólafur Arnalds Reveals The Story Behind Stratus



A spectrum of emotion

In our fourth collaboration with renowned composer Ólafur Arnalds, we bring you a brand new, multidimensional instrument, based on his acclaimed software: sophisticated midi algorithms programmed to trigger a mix of straight and syncopated rhythmic patterns of notes, on two identical self-playing pianos. Spitfire has used this model to create a highly intuitive and interactive tool enhanced with unique features, while recording full performances to capture the profoundly emotional, organic nature of the pianos themselves — instantly adding echoes of movement to anything you play, and pushing you to explore new possibilities.

Olafur Arnalds in his studio

Instant musicality

Stratus makes it easy to create nuanced piano-based music from the most simplistic of arrangements. Designed to help you write music or finish that track or score, hold down a note or a chord and lose yourself in unique, inspiring clouds of harmonic refractions and rhythmic performances as they swell, evolve and die away at your fingertips. Whatever the mood you are trying to create, it offers a whole spectrum of emotion, derived from user input — from intimate loops, swells and textures to intricate rhythms falling like rain, and dreamy, expansive soundscapes.

Detailed customisation

While specially curated by Ólafur, you control how these combinations of harmonic elements develop — both by what you play, and with extensive built-in customisation options, as well as a comprehensive range of effects. The four piano-based matrixes capture the stunning organic sounds of Ólafur’s pianos, panned across the stereo field to give a true representation of the pianos in their space, seamlessly blended into one, while the four synthesiser matrixes employ the same technology to create similar patterns, with stunning tempo-locked rhythmic loops made using Olafur’s Korg PS-3100, and dreamy swarm-like textures from his Juno-60. The Randomise bar features experimental controls to further randomise Stratus’ behaviour, taking advantage of the library’s generative nature. Stratus’ versatility lends itself to solo compositions, as well as adding texture and unpredictable elements to orchestral libraries, and complementing the libraries in our acclaimed Ólafur Arnalds series.

Stratus GUI

Bespoke interface featuring eight 8×8 matrixes complete with five Z-axis layers

  • Rhythmic waves: tempo-synced rhythms with a gradual attack/swell
  • Rhythmic attacks: tempo-synced rhythms with a strong attack
  • Looped rhythms: tempo-synced loops
  • Swarms: non tempo-synced swarm-like textures
  • Synth matrix: looped rhythms
  • Synth matrix: swarms
  • Synth matrix: swarms
  • Synth matrix – looped rhythms shorts 1
  • Synth matrix – loaded rhythms shorts 2

Extensive built-in customization options

  • Tempo-sync
  • Quantize on input
  • Polyphony – select how many voices are triggered at once
  • Straight piano overplay – play straight piano on top of evolving patterns
  • Low note priority, for added stability to bass lines
  • ADSR and a comprehensive range of effects
  • Randomise and evolve functions
  • Three straight piano presets with left, center and right signal options
  • Warped synth content, presented in our mercury synth engine
  • NKS ready

Stratus works by taking a single note and repeating it according to a curated rhythm, splitting the rhythm between the two self-playing pianos while at the same time relocating the note up or down the octave based on a curated level of randomness, that chooses whether or not the octave should jump. Where our Evo Grid technology is triggered by note range, the Stratus matrix works by voice groups — dependent on the order in which you play the notes, and how many you play.

Mics over a piano

Ghost in the machine

After suffering acute nerve damage following a car accident that left him unable to play with his left hand, Ólafur was motivated to develop intelligent custom software that could trigger self-playing, semi-generative ‘ghost’ pianos — his ‘robot writing partners’, and after spending two years experimenting with programmer Halldór Eldjárn to painstakingly perfect this technology, he incorporated it into his live show — playing an electronic keyboard on stage while his two identical pianos accompanied him to create a cascade of complementary notes and patterns, with each performance unique to each audience. The Stratus pianos also play an integral part in the sound world of his acclaimed 2018 record, re: member.

Captivated by this stunning fusion of emotive organic physicality and the ingenuity of electronic innovation, we spent several weeks at Ólafur’s studio in Reykjavik capturing these unique-sounding Yamaha DU1E3 felt-dampened pianos in their natural habitat. Rather than sampling single notes, we made full recordings of multitudes of polyrhythmic patterns and textures performed by both pianos, triggered simultaneously by algorithms, and carefully curated in collaboration with Ólafur. Recorded close using vintage KM83 and Coles microphones and pristine Millennia preamps, we have retained the beautiful resonances, and full dynamic and tonal range of his distinctive sounding pianos, brought to life by stunning technology.

The making of Stratus was my way-over-the-top way of getting over a writer’s block I had been suffering from. The excitement and thrill of creating something so unlike what I’d done before sparked countless new ideas.

Ólafur Arnalds

Olafur Arnalds composing in his studio

Ólafur Arnalds

Ólafur Arnalds is a BAFTA-winning Icelandic composer and producer, known for pushing the boundaries of music with his unique blend of organic and electronic soundscapes. Always a keen experimenter and innovator, with musical foundations as both a heavy metal drummer and pianist, Ólafur develops chamber strings and piano arrangements with effects, loops, beats, and his own innovative, custom-built software. Based in Reykjavík, Iceland, Ólafur’s approach to sound and composition has inspired a new generation to enjoy and create modern neoclassical music.

Since his debut album, Eulogy for Evolution, in 2008, he has steadily gained recognition worldwide, both as a BAFTA-winning composer (Broadchurch, Wayne McGregor’s Dyad 1909) and as a touring solo artist, releasing on neoclassical label Erased Tapes and receiving huge acclaim for his 2018 release, re:member. He regularly collaborates with other musicians — as part of experimental techno duo Kiasmos, and releasing a series of piano and synth improvisations with fellow musician Nils Frahm.

The latest in an acclaimed series

Discover our bestseller libraries created in collaboration with the celebrated Icelandic composer: Evolutions — unique string quartet textures and long evolving phrases; Chamber Evolutions — introducing his signature ‘Waves’ strings samples which evolve beneath your fingers; and the intimate Composer Toolkit — recorded on a characterful ‘felted’ grand piano. A must-have for musicians and composers influenced by the Scandi Noir movement, looking to create beautiful, progressive, hybrid ensemble music.


New update – November 2020

Our November 2020 update brings with it 9 new synth matrices giving users an extra compliment to the synth side of the library’s palette. Olafur curated all nine matrices himself, using all analogue synths, recorded through analogue processing (tape echos and delays) via Olafur’s Studer desk and all made using the pseudo-random curated sequencer that feeds the piano and the existing synths in the library. All synths represent a different rhythm, all curated by Olafur to fit perfectly with each other, and able to be randomised in the matrices for endless possibilities. The 9 new synth matrices are made up of 3 Looped Rhythms matrices, 1 waves matrix and 5 swarms matrices.

Olafur artwork

Stratus engine

Olafur Arnalds Stratus GUI
The bespoke Stratus interface is designed for the selection and playback of samples on a per-voice basis, offering a huge number of curated combinations of patterns with a few simple clicks on each Matrix, as well as Randomise and Evolve options which produce ever-changing patterns. Add effects using the FX page and assign these to the Quick FX bar for easy access. Quantise and synchronise options ensure your chosen patterns fit effortlessly into your composition.

Mercury synth

Stratus mercury synth
This ingenious user interface features a range of organic sounds and specially curated warped sounds. All of the controls are assignable to your control surface, giving you the ability to instantly make our sounds your own.


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