lately I've been trying to play some things with just my index finger? when I try to play a consistant rhythm I use my index finger. If I practice more I can get my index and middle finger to have consistant rhythm, but even then I get two different tones from each finger. one is more plucky than the other meatier mellower sounding finger. one has more skin on the tip, so when I can use just one finger I use my index. side note (sort of): doesn't geddy lee use two fingers together in an single stroke on the strings? but I guess then his style of writing will be taylored around his preforence for this approach.