just a question for some high note advocates. I was reading an article (If I recall on trumpet herald) that claimed you can boost the response of the Bb trumpet to get a few "easier" notes like a G bugle that used to be used in Drum Corps. Simply you had to put the 3rd valve down and the 6th space C would be as easy to get as the 5th space A. (of course you have to compensate with the 3rd valve slide -to get it in tune)
I haven't tried it yet - but I came across this youtube vid that seems to indicate that people actually do this.
[ame=http://www.youtube.com/watch?v=9TMmxvUBqyA]YouTube - Blue Devils 05 - Scott Dean solo - Gent, Belgium[/ame]