I made it thanks to all ! Creating an Instrument Rack. I saved different presets of my MASSIVE VST and than created different channel with those presets in an Instrument Rack. I used a Potard of my akai MIDI mix and mapped it on the chain selector, thanks to all
This is a solution you can use, but I would only use it when no other solution exists. I would also map it in a way that the chain selector is also mapped to the on/off button of the plug-in so that each instance is only turned on when the chain that plays it is active. Otherwise you waste precious resources.
But in this case it is not the method of choice since Massive supports preset change by Program Change message (the bank/program thing mentioned above that you find in all Midi clips.)
I would rather try to get that to work since then you don't have to use this work around that is cumbersome and potentially wasteful.