mahaberio

I'm a big advocate of simply knowing exactly what you want whatever you're playing to sound like and doing it. The way to develop different concepts of sound is simply to listen....a lot. And not just to trumpet players, listen to everything you can get your hands on. Then, when you start to learn a new piece of music, really sit down with it, study it, and get an idea of what you want it to sound like (hopefully paying attention to the composer's intentions as well). Do this for everything from Hummel to Stockhausen. Repeat as needed.