Yes, very rare; I really like those those few pre-show shots that have surfaced in recent years; you know, the ones of him jacking in to that USB port located right behind his left ear and then downloading that night's licks directly from the brain into the guitar....

Excellent!

Heh, yeah it looks like he's doing something like that, Carl.
I could write a lot about what goes through my mind when I look at this pic, what is that genious hearing, etc., but I won't. I'll just say the obvious: I think he's the cat's pajamas.