Ok, it now makes sense in terms of the connected expander and CV but I think I have one final question if you don't mind me asking.
I've now selected the right input and output as per your instructions.
I then select MIDI MAP in Ableton Live and I am able to map certain pads to certain functions in Live 10.
However, the QuNexus manual shows a different mapping which is way better than my own personal one.
It shows which pads are used to navigate scenes, launch clips etc.
Am I supposed to do this mapping myself or is there a way to access it?
If the latter, how do you access it? Is there a Demo Live Set somewhere?
In the downloads section, I indeed found a "QuNexus Ableton Live Sets" zip file which suggests this is Live Set download.
However, it's only the python surface control instead.