Sitka's excellent Gravity clock Eurorack module is now open source

Sitka's excellent Gravity clock Eurorack module is now open source - CDM Create Digital Music DIY + Unusual Gear Modular-Analog Music tech Tech Sitka’s excellent Gravity clock Eurorack module is now open source Peter Kirn - March 12, 2026 Add comment Share Tweet Kyiv-based Sitka Instruments is making the awesome Gravity Eurorack clock module open-source hardware. It’s an easy and affordable build, and there are already cool alternate firmwares available, with more to come. Sitka is supporting the community — and you can give back by supporting Ukrainian causes. Oleksiy Hrachov, aka Sitka, has written up a detailed, lucid explanation of why this is happening and what it means: Gravity goes open source [Sitka Instruments] And you’ll find everything — here using the self-hosted and open-source Gitea (which is a great alternative to GitHub and Microsoft): Firmware Hardware MIDI Expander Hardware Hardware is under a CERN-OHL-S license, with software under GPLv3. That’s “strongly reciprocal,” technically, for CERN but — think of both of them as copyleft. It’s really my favorite clock module, so it’s great to see this development. Not only is building Gravity something a lot of folks may be able to manage, but it’s easy to hack on, too. It’s Arduino-based, and developer Adam Wonak has created alternative firmwares and a helper library. If you’ve done even simple Arduino work, libGravity will look really accessible: https://git.sitkainstruments.com/awonak/libGravity And then there are the alternate firmwares: ALT-GRAVITY (rewritten for libGravity), Euclidean, and Comprator (analyzes signals and gives you flip-flop plus AND, OR, XOR logic): https://awonak.github.io/alt-gravity In action: More on the module — here’s a great “musical review” (like I have it playing and it’s fun to listen to ): And a groove from the creator — same, release this as a track, ha!: This does not mean the demise of Sitka Instruments, though — far from it! I’m eagerly anticipating Flamingo. Watch this space. And keep supporting Ukrainians. The world is erasing and destroying — support the people who are resisting and creating. Oleksiy recommends: https://www.hospitallers.life/needs-hospitallers https://tabletochki.org/en/ https://savelife.in.ua/en/donate-en/#donate-army-card-once https://uanimals.org/en/ https://sitkainstruments.com Previously: Inside Kyiv’s hackerspace, a growing DIY synth and experimental noise scene Share Tweet Tags: alternative firmwares , arduino , artists , CERN-OHL , clock , coding , copyleft , DIY , euclidean rhythms , eurorack , free , gplv3 , hacking , Hardware , modular , open source , open source hardware , Sitka Instruments Previous post Find whole worlds inside samples: Baby Audio Grainferno deep dive Related posts Hardware Video guide to accessibility in Ableton Move, Move Everything – Andre Louis artists Here are community-led efforts in Lebanon supporting the displaced modular The best way to learn Bitwig Grid, Serum 2 is in Japanese from LOBOTIX modular The developer of Tweakbench wants to remake the DAW without linear time