I have been struggling to learn dooden tonguing for years now, finally starting to get it. But I'm wondering if after a certain speed, or when you play 16th notes, do you continue muting/side-tonguing every other note? Or do you switch to every 4th note? I can't figure out how people get so fast at this otherwise. My tongue muscles do not move that fast! And my ears are not good enough to hear what's going on at breakneck speeds.