Hey! Thank you!
The communication is currently in SysEx, the 5th reserved USB port is used entirely for the communication, the other 4 ports are used only for musical data.
We will be looking at using COM / CDC instead for communication, this way the programming MIDI port won’t appear in audio software, resulting in smoother user experience.
We don’t plan to document the protocol we use, as it would require additional maintenance and support, we’d rather focus on making the editor as good as it can be. 