Bryan ... I couldn't help but notice this thread. I can't answer your query excatly, but I sure can share a couple of things I've seen in capo use lately. Last Fall, in Seattle, the great Alice Stuart gave us a concert during which she played with TWO capos at the same time. As I saw her setting it up, I started to think that she must be making a mistake. I soon learned it was NO mistake and she used BOTH capos to great effect.

Then ... a couple of months later, I saw a guy do one song at an open Mike in Seattle using THREE capos at the same time. And all these capos were full capos ... none of the pieces were mising!

I know I'm really old, and I change my habits very reluctantly, but this blew me away.

Kinda reminded me a when we all smoked, 100 years ago, and used to spear our lit cigarettes on the tail end of the high end string while we sang a song. CHEERS, Bob(deckman)Nelson