amtrpt

Hi Brent,
First of all I'm sorry for taking so long to respond and I really appreciate your patience.

Your question is a great one, and it's something that I have worked on a lot over the years. Here are a couple of ideas for you to think about and see if they are applicable to your playing.

One thing that I have found is that tounge position will have a pretty big effect on the upper register. When we are playing higher we are always trying to find a way to speed up the air without using tension of the throat or chest. I think using the tounge is the most effective to do this. Try to imagine using your tounge as a water valve that never closes, but when needed can raise up to make the water go faster. There are lots of ways to practice this with or without the trumpet. Just try blowing air and raising the tounge as you do it. Listen to the different sound the air makes. What you described sounds like a little too much chest or throat tension. I tend to find that it's easier to accept a more zingy sound when I get in the more extreme upper register like high C and up.

The other thing that I would suggest is stretching your registers slowly. I'm a big fan of three octave work. I prefer to start in the middle octave, work my way down then back up two octaves to the top. This way I have an excellent reference point for what the correct sound and feel should be. You can do this in any way that you want. Chromatic, whole steps, arpeggios etc. I only suggest that you do it mostly slurred at first so that you have as few inhibitions to the air as possible.

I hope that makes sense and is somewhat helpful. If you have any questions please let me know.

Best,
Andrew