Great ideas in this piece! I'm very much reminded of Steve Reich... ala electric counterpoint maybe? Anyways, I agree with benxiwf... I'm a hornist and I can say that some of those high notes really shoot out of the texture just because of the physical needs to play higher notes. But that might be okay... you'll just have to experiment. Also, the beginning feels a lot more in cut time than in a fast four. You might consider switching it up. Nice work! I enjoyed it!