This is my first post in this forum so I hope I've got it in the right section! I've recently started to pick up double tonguing (finally) and have encountered a problem with the titled piece of music! I'm having trouble at the end of bar twelve. I seem to have great difficulty in playing from D back to the Eb as sixteenth notes. I've tried using the D trill key while playing C however when I'm required to play the Eb from the D trill it requires fidgety and uncomfortable fingering. I've also tried playing C -> D normally and using the trill key before the final D but my brain doesn't seem to like doing this and prefers to either use the trill key or switch between C->D normally which doesn't work (I find) when playing sixteenths double tonguing?
So I've probably drawn that explanation out far more than necessary but hopefully you see where I'm coming from! I'm doing this piece to practice my double tonguing which seems to be helping but it's just this section which repeats a few times in this piece! Any constructive advice is welcomed. It may just be that I need to work on co-ordinating my fingering and my tonguing but I really feel I need clarity on which fingering is best, as the trill key doesn't seem completely efficient.
http://www.flutetunes.com/tunes.php?id=170 (The music in question [See end of bar 12])