Hello! Long time lurker
This is of course an Interesting thread to read and I am happy to answer any questions about our design philosophies, objectives and approaches to creating modules.
We are actually coming up to our official ten year anniversary and so it is quite interesting to look back at how much has changed since we started out. This should be an interesting year for the evolution of intellijel 
Although our designs have evolved quite a bit, I like to think there is one thing we have tried to keep consistent, especially with complex digital designs, and that is for the core functionality to be very apparent and easy to access from the front panel. All of the deeper functions are there to explore once you get more comfortable with the basics (or to be completely ignored).
The Quadrax follows this philosophy pretty closely; Without reading the manual you should be able to easily select different modes (only five to cycle through), trigger the functions and adjust their timing/shape. Then you can play with the link buttons to get a bit deeper on how adjacent envelopes can relate to each other. After that you can explore simple CV mapping (ignore the matrix aspect at first) and press and hold a channel you want to assign CV for and use the default selected CV channel. e.g. Channel 1 defaults to CVA, Channel 2 defaults to CVB etc. This allows you to map one CV source to one channel and then choose 4 different destinations on the right side (rise/fall/shape/level). You could even ignore the attenuator steps and just use external attenuators since it defaults to full level anyhow. Then once you are comfortable with this you can try the mod matrix and built in attenuverter steps (step through levels of attenuation, press and hold to invert to negative). We’ll be posting some workflow and example videos next week. We put a lot of work into making everything logical and consistent with our other modules so that you would not need to keep referring to the manual. It was very important to us that the immediacy of the original Quadra was not lost on the Quadrax.