A sound designer's dream.
A friendly, open community.

Featuring many synthesis techniques, a great selection of filters, a flexible modulation engine, a smorgasbord of effects, and modern features like MPE and microtuning.

Surge is a wonderful tool. We love it. We think you will, too!

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 created these songs using Surge 1.6 only!

Do give them a listen!

As great things are bound to repeat themselves, Surge was chosen as the featured synth once again, for OSC 138! This time, it was Surge 1.7 taking all of the sound generation duties. That just means there is even more music featuring Surge available for your listening enjoyment!

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 surge-synthesizer GitHub 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 to create layered or split patches.

Quick category-based patch browser

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

Factory Sounds

2285 patches

614 wavetables


3 oscillators per scene, with 12 versatile oscillator algorithms: Classic, Modern, Wavetable, Window, Sine, FM2, FM3, String, Twist, Alias, S&H Noise and Audio Input.

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

Modern oscillator is a mixable saw/pulse/triangle oscillator with an optional sub-oscillator mode for triangle (which can also change to sine or square) and hard sync.

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

String oscillator uses two filtered waveguides to emulate plucked or bowed string sounds.

Twist oscillator is based on a very famous Eurorack macro oscillator, and it offers a myriad of synthesis options in a very simple and quick way.

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

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

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

Noise generator with variable spectrum (available directly in the oscillator mixer).

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), Legacy Ladder Lowpass (6-24 dB/oct), Vintage Ladder Lowpass (2 variations, each with and without gain compensation), 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), Allpass (3 variations), Comb (positive and negative), S&H.

Open-source additions to our filter bank contain: K35 and Diode Ladder filter types from Odin 2 synthesizer, 12 and 24 dB/oct multimode filters from OB-Xd, and weird but fascinating Cutoff Warp and Resonance Warp filters by Jatin Chowdhury!

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.

LFO shapes consist of 7 deformable LFO waveforms, step sequencer, and a fully-fledged multi-segment envelope generator (MSEG), with various curves and up to 128 nodes.

Voice LFOs allow envelope retriggering in step sequencer mode.

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.

24 effect algorithms:

3-band fully parametric EQ
11-band graphic EQ
Tape (based on ChowTapeModel!)
Frequency Shifter
Ring Modulator
Rotary Speaker
Reverb 1
Reverb 2
Airwindows (itself containing 53 effects!)

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 would have been 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 Discord server 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 topics, 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 and use it in your own workflow.

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 be 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


  • Surge is an Intel/Apple Silicon universal binary. Intel macs require macOS 10.11 or later, Apple Silicon macs will run Surge with any Apple Silicon version of macOS
  • 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
  • VST3-compatible host application
  • x64-compatible CPU, OS and host is required to use the 64-bit version


  • PC or ARM system running a Linux distro
  • x64-compatible CPU, OS and host is required to use the 64-bit version; for ARM processors you can build Surge for ARM on Raspberry PI and similar (tested with RPI4/arm64)
  • Minimum of 4 GB of RAM
  • VST3-compatible host application



Nightly builds:

Download the nightly builds here!
( Updated on 2021-04-25 15:05:03 UTC )

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