Ok, I said nothing about controllers…
I’ve found that the CC’s are shared by both “synth engines”.
The only way to edit separately those 2 engines is using sysex.
MVXSynths
R3 / MOX6 / Electribe2 / Electribe R MkII / Electribe MX / K4R / BCR2000 / XStation61 / XStation25 / Virus Rack / Chameleon / Proteus 2500 / RM1X / KN2600