@jamieh at the end I preferred mapping VB3, because it keeps the new mapping when closed and relaunched, while the MIDImix editor doesn’t
Moreover, the MIDImix editor is absent-minded sometimes, losing the mapping, that is quite bothering
I also tried to understand what’s a “yoke”, and I tried the Bome tool, but I was unable to do anything: programming is not for me 
And here is my final remapping on the MIDImix
Red circled are Drawbars Upper SET A
Yellow circled are Drawbars Upper SET B
Blue circled are the VB3-II central panel
The vibrato is linked to my Alesis Q49 Data Entry
And all sliders (green circled) are Ableton Live volumes
The routing in Ableton doesn’t change