I just bought the Cream at Royal Albert Hall DVD, and I must say, it kicks ass. However, I was quite surprised when I saw Jack Bruce using the same up-down middle finger technique that Geddy Lee uses. I'm positive Geddy copped it from Bruce, but I have a question for you guys about the technique (if you have seen it). When the middle finger is going up and down, is it only hitting the string on the upstroke or both upstroke and downstroke?