Open Source Synth Designs


GMSN! Eurorack Modules are released under the
CC-BY 4.0 Creative Commons license.

This means you are “free to share and adapt the designs for any purpose, even commercially.

There are, however, limitations, which includes giving appropriate credit, a link to the licence and indicate if changes were made.

You may do so in any reasonable manner, but not in a way that suggests the licensor endorses you or your use.”

This is the only website that is endorsed to sell GMSN! PCBs and Panels.

“No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.”

Supporters of GMSN! will have free access to support and build documentation via the Forum. You may create an account during checkout.

Thank you for supporting GMSN!

More info on CC-BY 4.0

The Modules

DIY Eurorack Synthesiser Modules.
New modules will be added regularly.

How to use this site and how to build a modular synthesiser.


Buy a PCB & Panel and create an account at checkout.


Access the Bill of Materials and Build Docs on the forum.


Order components on the BoM from Mouser, RS Components, etc.


Watch the tutorials in the Techniques section of the forum.


Build your modules and get help and support from the forum.