is there any tips for tounging really quickly? such as in coplands hoe-down from rodeo? the notes f#df#d adf#d edef# gf#ed then again an octave lower... and f#df#d adf#d edeg f#dd and that an octave higher? they are in sixteenth notes and then the f#dd is two sixteenth notes and an eighth note.

I actually double tongue those. Whether you choose to double or single tongue them, I would suggest working up your speed and endurance by tonguing on a low D. Start out slow and gradually pick up your speed, making sure that you can tongue the notes clearly and consistently before speeding up. Also when your practicing this, make sure to play a full 2 measures of 16th notes, since you will have to in the piece.

i have actually no idea how to double tounge..

dagadagadagadagatakataktakadagataka......learn the syllables, practice without your oboe, use a metronome and start slow. Ta and da are tongue initiations, while ga and ka are throat initiations. Takes somework but its fun when you can do it correctly, I recently learned how to double tongue properly(on flute anyhow, some oboist please correct me if this does not apply to oboe...)

That's right. It helps to practice it on the reed alone first. TaKa is probably the best way to think about it on oboe. When your first learning it, make sure that on the Ka syllable your tongue completely blocks the air. It will sound really ugly at first, but after you work on it for a while, it will start to sound more like normal tonguing.

You can double toungue with the oboe, sure. However I don't think that the oboe was specially designed around being able to double toungue. (As with the English horn, bass oboe, oboe d'more, and other double reed instruments.) In other words, it's like teaching a horse to sit. It really isn't meant to happen, but it can be done with practice.