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The actual source code is hosted on separate repos I believe: https://github.com/heronarts/LXStudio-IDE

Even this appears to just be a limited source repo containing just the most basic UI components. Also, per the README:

> Please note that LX Studio is not open-source software.

Ahh good catch, I just glanced at the repo and assumed it contained source code but it looks like its just a bunch of jars: https://github.com/heronarts/LXStudio-IDE/tree/master/lib