Open-source virtual modular synthesizer
Clone or download


Rack is the engine for the VCV open-source virtual modular synthesizer.

For information about the software, go to the VCV website or the VCV Rack manual.

The Issue Tracker is the official developer's forum

Bug reports, feature requests, questions, and discussions are welcome on the GitHub Issue Tracker for all repos under the VCVRack organization. However, please search before posting to avoid duplicates, and limit to one issue per post.

Please vote on feature requests by using the Thumbs Up/Down reaction on the first post.

I rarely accept code contributions to Rack itself, so please notify me in advance if you wish to send a pull request.


All source code in this repository is licensed under BSD-3-Clause by Andrew Belt.

Component Library graphics in res/ComponentLibrary are licensed under CC BY-NC 4.0 by Grayscale. Commercial plugins must request a commercial license to use Component Library graphics by emailing

Core panel graphics in res/Core are copyright © 2017 Grayscale. You may not create derivative works of Core panels.

The VCV logo and icon are copyright © 2017 Andrew Belt and may not be used in derivative works.

The "VCV" name is trademarked and may not be used for unofficial products. However, it is acceptable to use the phrase "for VCV Rack" for promotion of your Rack plugin. For all other purposes, email