Let's say I have two instances of VI Pro in my DAW. 

I go to the 'Control Map'. 

For the first instrument, I set CC1 to control Velocity XF. 

For the second instrument, I set CC1 to control Expression. When I go back to the first instrument, I see that CC1 now controls Expression instead of Velocity XF. 

In other words, when I change one instrument, it changes them all. 

I don't want this to happen. How can I stop it? 

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Never mind. I discovered that I could turn this behavior off by going to 'General Settings" and unchecking 'Synchronize Control Map'. Thank you, VSL, for making awesome software, and giving such flexibility to users!