I've recently started to learn how to alternate, I can quite easily pass or even FC high-BPM songs, but the trouble for me starts when triplets and/or medium-sized streams are involved. For the longest time I've been singletapping with my index finger, and I can do triplets just fine when I start them with my index finger, but whenever I try to start a triplet with my middle finger I just screw up the timing and I was wondering if anyone had advice as to how I can get around this problem.