Another technique I still have to master...
I do it on my own but this year I will practise under teacher supervision. Otherwise I find it difficult to notice if the notes sound equal as they should.

Last year I worked on it a little in the school lessons.. but then just kind of ignored it until I started private lessons last summer. I actually got it pretty quick. We used just a short song in a lesson book that was all eighth notes and just start REALLY slow and work your way up.

I really HAD to learn it for the all-state etudes (although I ended up auditioning on violin, I learned both then picked. I had to have flute stuff for the audition for my schoos top band anyway, plus they were fun! Not a waste of time at all IMO) and I really had to get it down for my solo, the Mozart Flute Concerto in G Major (1st movement)

You can also practice DTing when your not playing your flute. Just practice in the car, walking.. wherever.

I'd say the biggest thing is to start out REALLY REALLY slow and work up the speed.

try this, play a scale slurred, then double tongued, slowly and relaxed, always think of groups such as 4 or 6 notes when double, don't obssess about the tu-ku or du-gu too much..

you can also play a group of 4 notes on each step of the scale double.gradually increasing speed...you must stay relaxed, that's why you should play everything slurred first, then double...

I fought against DT for such a long time, i didn't like it, it felt uncomfortable. Fortunately for me, my new teacher is very insistant so i've had to work on it a lot in the past few months. So .... i now love DT, it's the easiest thing in the world to do, it feels comfortable and i can't understand why i made such a big fuss over it.

Take it slowly, always use a metronome so that you can "see" your improvements, yes your single tongue will be faster for the moment but don't be tempted to lapse back into it, keep going and then all of a sudden .................... !!!!!! :-)

Good Luck
Angie

Your just being impatient...DT Is a long slow process that takes a while to get good at and you have to practice it every day. if you go a week without practicing DT you'll lose it. I had to DT in one of my etudes at 132 for all state and it took me 3 months to get it good and up to tempo...I started my etude at 75 at first to get everything blanced. after awhile I bumped the metro up 10 more...trust me if you be patient and practice DT everyday for at least 15min or more you'll see some improvment(but not over night)

the speed depends on the type of notes you're playing, try for smooth tonguing rather than speed, fast tonguing done sloppily is of no use, always put tone and clarity ahead of speed, that will come in time...