| Calliope,
The reason people have trouble with this, all things being equal, is twofold:
1) There are subtle but significant changes that occur in the corners that make double tonguing sound worse in the upper register if you're not vigilant. Keep those corners from curling up and away and the sound won't change. It's hard work, though, I gotta tell ya.
2) It's not something people practice until they need it and that's the biggest problem. They don't like practicing it because it's a pain in the neck, like keeping piccolo chops up when it's not the main thing you do. But you have to do it!
So, lot's of TOO-KOO up there (no tee-kee) and do it often.
ML |