Nonlinear Labs C15

5.0 (2)

3 Critic Reviews

1 Review

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Page last updated Mar 16, 2026

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Description

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The C15 is a keyboard instrument made for performing musicians. Its character stems from a puristic digital engine which produces a unique palette of sounds seamlessly spanning from organic and acoustic to experimental and electronic.

With its top-quality keybed, dual full-length ribbons, special pitch bender, and four pedal connections the C15 is designed for real-time performance, making it more like a traditional musical instrument than a typical synthesizer. It is resolutely an instrument to be played by musicians, not machines. Therefore it has no MIDI and does not contain LFOs or internal sequencers.

Videos

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Matt Johnson Jamiroquai

What is this??? Nonlinear Labs C15

Matt Johnson Jamiroquai

Nonlinear Labs C15 Review: €4000 for a two sine-wave synth? How C15's elegant engine & controls work

loopop

Nonlinear Labs C15 Synthesizer Sounds

Perfect Circuit

Stimming reviews Nonlinear Labs C15

Sense Music & Media GmbH

NAMM 2023 - (SOUNDS ONLY) C15 by Nonlinear Labs

sonicstate

Nonlinear Labs C15 - the new Sound Designer Bank by Dr. Manny Fernandez

Nonlinear Labs

Nicholas Semrad plays the Nonlinear Labs C15 - PART ONE

Nonlinear Labs

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Nonlinear Labs C15.

Comparisons

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The Korg Opsix and Yamaha DX1/DX5 are cited as potential alternatives, though the C15's expressiveness is unmatched due to extensive parameter velocity support.
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Reaktor's Kontour is noted for its similarity to the C15, as both were developed by the same creator, allowing for similar synthesis methods.
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The C15's feel and response are described as more akin to an acoustic instrument than typical synths, setting it apart from other hardware.
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Features and functionality

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The C15's uniqueness stems from its sine wave oscillators, providing exceptionally organic sounds not easily replicated by other synths.
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The C15 lacks MIDI connectivity, which limits external integration but enhances its focus as a standalone expressive instrument.
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Software and compatibility

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The Reaktor ensemble is suggested as a cheaper alternative to achieve similar sound design capabilities as the C15.
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The C15 can network with a high-resolution editor on various devices for efficient patch management and editing.
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Build quality

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The keybed quality is exceptional, surpassing most synths, making it highly responsive to nuanced playing.
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User experience

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The 'one knob, many buttons' interface, initially daunting, becomes intuitive and fast with use, eliminating common menu-diving frustrations.
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Value and pricing

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Despite its high price, the C15 is praised for its unique sound and expressiveness, making it a worthwhile investment for those prioritizing playability over connectivity.
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Critic Reviews

Nonlinear Labs C15

soundonsound.com

The Nonlinear Labs C15 synthesizer breaks the mold with its unique Phase 22 synthesis engine, delivering a complex sound design experience that stands out in a crowded market. Its innovative dual-unit design and extensive modulation capabilities make it a playground for sound designers. However, the steep learning curve may leave less experienced users frustrated as achieving desirable sounds can require significant time and effort. Some issues with pedal functionality further complicate usability, but the overall sonic richness and versatility make it a compelling choice for adventurous musicians.

positive

Full Review

Nonlinear Labs C15

soundonsound.com

The Nonlinear Labs C15 is a unique synthesizer that delivers remarkable sounds but comes with significant limitations. While its design and playability are commendable, the complex programming interface and lack of MIDI integration may deter many musicians. It excels in creating innovative tones but lacks lush sounds and conventional modulation options. The promise of future upgrades is a silver lining, but potential buyers should be aware of its steep price and the need for a steep learning curve. Ultimately, the C15 is a niche instrument that will appeal to some while leaving others longing for more versatility.

neutral

Full Review

Nonlinear Labs C15 Review – €4000 for two sine waves? How C15’s elegant synth engine works – Loopop

loopopmusic.com

The Nonlinear Labs C15 is an intriguing boutique synth that pushes the boundaries of sound design with its innovative modulation capabilities and diverse synthesis methods. Its unique hardware controls and elegant synth engine offer a playground for creativity, catering to those who love to experiment. However, the steep learning curve and somewhat convoluted interface may deter less experienced users. While the C15 excels in producing complex and rich textures, its usability can feel overwhelming at times. Overall, it’s a powerful tool for adventurous musicians, but it may not be the most accessible option for everyone.

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5.0 out of 5

Based on 1 Review and 2 Ratings

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rolandmdill

105

over 5 years ago

Greatest digital synth on the market

This is truly a musical instrument, super expressive, amazing sound quality and a unique programming concept. Doesn't have midi or any other way to sequence or sync it though, unless you program a robot to play it. According to the founder of Nonlinear Labs he wanted to build an instrument specifically designed for skilled musicians, not another show off item for the average dj/producer/influencer. This synth really changed my opinion about FM synthesis and digital synths in general, every element in the synth engine is parameterized and can be assign to four super expressive control layers. Despite this high complexity it is still quite easy and great fun to program. In my eyes and ears the C15 is unrivalled and a dream instrument for every skilled keyboardist. Highly recommended!!

Artist usage

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Jean Michel Jarre

Keyboardist, Music Producer

The Dustbins

Verified via YouTube

introduces at 4:50 in the video

Stimming

Music Producer, DJ

Verified via YouTube

At minute 10 Martin ist talking about his favorite digital synth.

Paul Haslinger

Guitarist, Keyboardist

Tangerine Dream

Verified via Heavyocity Media

"My setup is centered around a Cubase10/Win10 system. This is the hub that everything else is connected to. For audio AD/DA is am using BURL converters.

On the software side, using a lot of UAD, FabFilter, PSP and Soundtoys plugs. With libraries, sticking to Heavyocity (of course;) VSL, Orchestral Tools, 8dio, Spitfire, Arturia, NI, U-He, Omnisphere.

Hardware: Arturia controllers and MatrixBrute, NonlinearLabs C15 and an arsenal of vintage boxes I keep around for good company (ARP, Oberheim, Moog)"

Anthony Marinelli

Keyboardist, Composer

Verified via YouTube

Anthony Marinelli is confirmed to use the Nonlinear Labs C15 synthesizer, as it is prominently featured at the 1:20:18 mark in his YouTube video titled "My Synth Studio Revealed | Studio Tour 2025," published by Anthony Marinelli Music.