It's back, open source, and amazingly powerful.

Download (1.7.1 - 2020-08-02 )

Other ways to get Surge

Roger Linn demonstrates Surge on his Linnstrument.

Surge Videos

We have a collection of great demos on our YouTube channel.

Explore the videos!

One Synth Challenge,

Thank YOU!

We think it's pretty cool that you picked Surge for the One Synth Challenge.

A group of musicians over at OSC made these songs using Surge 1.6 only!

Please give them a listen.

Digital Beauty

Surge is a digital synth and makes no bones about it.

If you have used it in the past, it will be like welcoming an old friend back into your life. If you are new to Surge, welcome to the party. Come on in, the water is fine.

Surge is back and open source!
Thanks to the generosity of @Kurasu (owner of Vember Audio), Surge has been open sourced and lives on GitHub. This page you're reading right now. Yup. This one right here. It's part of the GitHub OSS Surge-Synthesizer project.

Synth Specifications


Synthesis method: Subtractive hybrid

Each patch contain two 'scenes' which are separate instances of the entire synthesis engine (except effects) that can be used for layering or split patches.

Quick category-based patch browser

Runs on a variety of operating systems, plugin formats, and architectures

Factory Sounds

1725 patches

523 wavetables


3 oscillators per scene.

8 versatile oscillator algorithms: Classic, Sine, Wavetable, Window, FM2, FM3, S&H Noise and Audio Input.

Classic oscillator is a morphable pulse/saw/dual saw oscillator with a sub-oscillator and hard sync.

FM2/FM3 oscillators consist of a carrier and 2 or 3 modulators and various options.

Most algorithms (except FM2, FM3 and Audio input) offer up to 16-voice unison at the oscillator level.

Oscillator FM and ring modulation between oscillators 1-2 and 2-3.

Most oscillator algorithms (except FM2, FM3 and Sine) are strictly band-limited, yet still cover the entire audible spectrum, delivering a clear punchy yet clean sound.

Noise generator with variable spectrum.

Filter Block

Two filter units in 8 different configurations.

Feedback loop available in 7 of those configurations.

Available filter algorithms: Lowpass (12 and 24 dB/oct, each with 3 variations), Lowpass 24 dB/oct (3 variations), Ladder Lowpass (6-24 dB/oct), Highpass (12 and 24 dB/oct, each with 3 variations), Bandpass (12 and 24 dB/oct, each with 3 variations), Notch (12 and 24 dB/oct, each with 2 variations), Comb (4 variations), S&H.

Filters can self-oscillate (with excitation) and respond amazingly fast to cutoff frequency changes.

Waveshaper (5 shapes).


12 LFO units available, 6 are per voice and 6 are global for the whole scene.

DAHDSR envelope generators on every LFO.

7 deformable LFO waveforms and step sequencer mode.

Voice LFOs allow envelope retriggering when used as step sequencer.

Extremely fast and flexible modulation routing. Almost every continuous parameter can be modulated!


8 effect units arranged as 2 inserts per scene, 2 sends and 2 master effects.

13 effect algorithms:

EQ, Distortion, Conditioner (EQ, stereo image control and limiter), Frequency Shifter, Rotary Speaker, Ring Modulator, Vocoder, Chorus, Phaser, Flanger, Delay, Reverb 1, Reverb 2

Contributors Welcome!

Surge is supported by a community of volunteer open source developers, designers, testers, musicians, synthesizer enthusiasts, and content creators.

Without them, none of this is possible. If you're interested in seeing what's going on with the project the best thing to do is:

View the Surge Project Page


If you are interested in contributing, we welcome developers who know or want to learn C++, git, graphics and Web design.

There’s plenty of open issues and our Slack channel can help you find a good first one if you want.

Hop over to the project issues page to see what we need help with.

View surge-synthesizer GitHub Project Page

You can also join the conversation in #surge-development channel at the Surge Synthesizer Discord server. We'll help get you started!

Join Surge Synthesizer Discord Server


If you would like to pitch in and have interests in UX, UI, visual design or any other design related topic there are plenty of open issues.

The #design channel on Surge Synthesizer Discord server can help you find something to get started with.

Join Surge Synthesizer Discord Server


Know any testers? Umm, asking for a friend.

Testing is a way that everyone can help contribute. All you would need to do is install a copy of Surge.

There are so many combinations of operating systems and DAWs that it is really difficult to make sure everything gets tested under all contexts.

If you would like to get involved jump in over here:

View surge-synthesizer GitHub Project Page

Content Creators

If you love to use Surge and make amazing presets or music we want to hear from you.

In fact, we would love to have you pitch in and help out with the project!

We are looking for people that have content that showcases Surge in all of its glory.

If you make patches, write entire songs using only Surge, or anything in between we would love for you to get involved.

View Surge-Synthesizer GitHub Project Page


We love Surge. We also love people.

Community is a big thing to us on this project. We want an inclusive, positive, and happy community with contributions from a large set of differing viewpoints and backgrounds.

Let's be kind to each other and treat each other with respect. It takes all of us working together to make the community great.

We are looking forward to your insights and contributions.

Let's make something amazing!

- The Management

Get Involved Here

System Requirements


  • Intel Mac running at least macOS 10.11
  • Minimum of 4 GB of RAM
  • VST-compatible or AU-compatible host application


  • Windows 7 and a recent Intel processor (at least Pentium 4 or above)
  • Recommended: Computer running Windows 7 64-bit or newer
  • Minimum of 4 GB of RAM
  • VST-compatible host application
  • x64-compatible CPU, OS and host is required to use the 64-bit version


  • PC running a Linux distro
  • CPU must support the SSE2 instruction set. This has been supported on Intel CPUs since Pentium 4, and on AMD CPUs since Athlon 64.
  • Minimum of 4 GB of RAM
  • VST-compatible host application
  • x64-compatible CPU, OS and host is required to use the 64-bit version



Nightly builds:

Download the nightly builds here!
( Updated on 2020-10-28 09:45:31 UTC )

This project is maintained by the community at the GitHub Surge Synthesizer open source project