I know, from seeing the scores of a number of B'way musicals, that the orchestrator will annotate the brass parts with the direction "Brassy" sometimes. I assume that this is meant to distinguish between mello and bright sounding brass. I also assume, since this is a direction to the performer, that the relative amounts of brightness and mellowness can be controlled by the musician. I am just wondering what they player actually does to alter the sound.
More practically speaking, I am wondering if some of the sample libraries I own, where the brass sounds brassier than others, is due to the manner in which the samples were played (or equalized) or whether one musician was just playing them more "brassy" than the other.
For example, I am currently using two trumpets, one tenor trombone and one bass trombone from the JABB library in my score. Since JABB uses Bb Trumpets and GPO uses C Trumpets, I am sticking with the JABB libraries for the trumpets. The JABB tenor trombone sounds okay with them, but the bass trombone is on the mellow side and seems to spread a bit. While this is fine for most numbers - especially the ones that include Westgate's French Horn - there are a couple where I want a brighter or more majestic sound. I'm wondering if I should use a bass trombone with a brighter sound, from one of my other libraries, in those numbers. If it would mean having a musician bring in two bass trombones for a live performance, it's not worth it. But if the brassiness can be controlled by the player, then using the brassier instrument where needed is a reasonable substitution for my demo.
Another idea: Do any bass trombone instruments allow you to control the brassiness of the sample? Again, I don't mean eq or other processing that the musician won't be able to replicate live - I'm talking about stuff that he can actually do with his lips or breath to influence the sound. I don't care if the sample uses processing to get that effect - I just don't want to give somebody a demo that they can't replicate without switching instruments or playing into a mic and processing it. I hope you know what I'm getting at here.