It depends on what you are planning: free or paying, if you want to share, the Ircam Forum offers a GitLab to its members but you can use GitHub. I understand that you want, above all, your patch to be solid. As for quadraphony, I am disappointed, I prefer hexaphony, which I consider as a minimum.
The idea of using Jitter is a good solution, and it’s true that your basic patch can have several futures but things will be clearer when you’ve completed your basic project.…
Best, happy patching
Jerome