I got this new technique i'm working on for a month or two. IT's the one that you use your index and middle fingers to hit the string two times each ,on it's way up and on it's way down. (a bit like the DT but with the index and middle fingers). Now... i wanted to know if anybody here use this technique and can give me some piece of advice on what's the best way practice it? My main problem is that when i do it fast i mistakely hit the string above the one i'm playing... i tried to move my thumb to the string above the one i'm playing but it realy slows me down, as i'm used to placing my thumb up on the E string. Thanks in advance.