I was mostly interested in software control from the connected computer, and I’m happy that this is working now. Here are the things I had to do to set it up.
As @niks.arturia mentioned above, being on a Mac I had to go into the Audio MIDI Setup app, choose “Show MIDI Studio”, find the AF16Rig MIDI device, and delete it (hit delete on the keyboard) with the 16Rig turned off (it won’t delete if it’s currently connected).
Note that the old version has 4 MIDI ports.
Then, turn the unit back on and it will be added back to the end of the device list, with 5 MIDI ports:
(The first time I turned it on, the device didn’t pick up the correct name for some reason. I turned it off, deleted it again, and turned it on again. It worked on the second try.)
Now the new Mixer Control MIDI port shows up at the end of the Ableton Live MIDI settings. I turned on “Track”.
Then selected that in the MIDI To menu of a MIDI track:
As mentioned earlier in the thread, you also need to set the 16Rig Mixer Control setting to USB Device.
I tested it out using the CC Control device in Live 12. I used the (honestly kind of haphazard) Factory MIDI CC mappings in the 16Rig and assigned the CC Control dials to the aux bus levels and track levels.
After clicking the Send button to reset the mixer settings, everything works great. I did notice that there is some value scaling happening, and the position of the aux dials in the AFCC Main Mix page doesn’t exactly match up with the position of the corresponding dials in Live. They do cover the entire range. It’s not a problem, just something to be aware of.
I put it in a rack to make the knobs more accessible and hide the unused controls. It also works well with my Push 3 in controller mode, and I would assume also earlier Push versions.
Here’s the device file. Feel free to use it or tweak it as needed.
I hope this is helpful to someone!