@Elia can you please try this Gig file. I have created a scriptlet that will convert the CC messages from your Launchkey buttons into a PC message that will change the GP rackspaces. This scriptlet is in the global rackspace.
Open the file and see if GP will change the rackspaces when you press the buttons?
CC to PC Conversion for Launchkey.gig (95.5 KB)