I would like to suggest that the style of show you are doing also dictates the sound of the brassline. For example, a brass line playing jazz would probably have a brighter sound because of the nature of the idiom....more soprano voices, more aggressive low brass (baritones, etc) and a somewhat brighter mellophone sound....
This is one of the reasons why more and more corps have gone away from true jazz shows.......for one thing, many young judges don't credit these hornlines for the style they are achieving. I know we fought that all the time.......the legitamacy of the jazz style and the fact that we are asking our performers to do so much more with articulations, inflections....no offense to all of you classical buffs out there, but teaching jazz to a DCI brassline offers many more challenges to the students and the instructors. In addition, when you achieve it at a high level, you often don't get the credit you deserve!
The extremes of ranges are more demanding, the style is more demanding and the nuances of a jazz book are much more demanding...yet many judges percieve the exact opposite when evaluating a jazz show.
I mean...."The rite of spring", all you have to do is accent one upbeat eigth note every once and a while......contrast that to a Buddy Rich chart or Pat Metheny....there ain't no comparison really.
As always...IMO!
Peace Out!