![GreyBoxAudio SG-323 (Ursa Major Stargate 323 Emulation) v0.7.0 WiN Mac Linux [FREE] screenshot](/templates/Default/img/1x1.gif)
FREE | Win Mac Linux VST3 CLAP | 43 MBThis plugin is an authentic emulation of my Ursa Major Stargate 323 Reverb. It is based on over four years of work, which included a detailed analysis of the original circuit logic and filters, as well as eprom data.
This personal project is in no way affilliated or associated with Ursa Major Inc / Christopher Moore / Seven Woods Audio Inc / AKG
In 2019 I had the incredible opportunity to acquire an Ursa Major Stargate 323 in mint condition for a very affordable price. The unit I bought previously belonged to the Institute of Musicology at the Johannes-Gutenberg University Mainz and I really have to thank Dr. Albert Gräf and his team at the Computer Music Research Group
Because this reverb is quite special and very rare, I'm doing everything I can to preserve it and share as much information about it, as possible.
Note:
This is the latest available free release; a commercial version can be purchased from the official website: https://store.greyboxaudio.com/products/sg-323-reverb
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Changelog:
0.7.0
Important changes!
This will be the last release to include pre-built binaries. To fund my development efforts I will release this plug-in as a one-time payment in March. Current users receive a 100% discount. This project will continue to be open source and all future releases can be built from source.
Why the change?
While I happily invest my spare time there are hard costs associated with releasing a plugin. Apple requires code to be digitally signed, which requires a yearly developer membership. The next SG-323 release will also debut AAX support for Pro Tools, which requires code signing on Windows as well. I also need access to multiple hardware platforms and DAWs just for developing and testing.
How can I get the discount?
Please send an email to [email protected] before March 1st 2025. I will inform you once the plugin is available for purchase and you will receive a personalized 100% off discount code.
What's actually new in 0.7.0?
Lot's of under-the-hood improvements: the plugin has been built with JUCE 8 & latest CLAP extensions, I've implemented JUCE's AbstractFifo class to resolve looped playback issues in REAPER & Ableton, all elliptic filter coefficients have been updated, gain of the internal reverb input is reduced when the plugin is loaded on a stereo track
Will the commercial release have copy protection or be subscription only?
No. It will be a simple one-time purchase and the plugin will be DRM free. Buyers will also receive all future updates to SG-323 at no additional cost.
What will happen to this repository?
Everything will continue as before. All pre-compiled binaries up until version 0.7.0 will continue to be available free of charge. All my development will continue as open source in this GitHub repository. If you build the VST3 & CLAP plugins from source they will have the exact same features as the commercial releases. While AAX can also be compiled from source it will not show up in Pro Tools unless it has been signed with proprietary tools from PACE.
How can I build this plugin myself?
I have added build instructions for all platforms to the README. I also plan to release more detailed video tutorials in the future. "Build It Yourself" is actively encouraged and if you have suggestions to improve the build workflow feel free to reach out.
What's next?
As already mentioned the upcoming release will include AAX support on Windows and macOS. The GUI has also been overhauled and will be resizable.
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![GreyBoxAudio SG-323 (Ursa Major Stargate 323 Emulation) v0.7.0 WiN Mac Linux [FREE] screenshot](https://audioz.download/uploads/posts/2025-05/1746505307_4042445565.webp)
