Patches and discussion for Ensoniq VFX family

I've had my VFXsd for two years, and I still havn't figured out how to 
latch the patch select buttons. I mean if I want the both bottons down 
patch, how do I set it so i can take my left hand off the buttons? I 
feel kind of silly asking this because it's probably something really 
simple, but I really don't know the answer.