well, i don't know, my director, Jeremey Earnhart told me in 9th grade that i play on my mouthpiece slightly to the right, then he told me that i needed to fix it && that it would improve the way i sound. So it took me a couple of weeks of getting used to just putting my lips there, but by then, i realized that my sound was WAY better... My sounds didn't sounds as "dead" or "wet" as he said it did before. So i guess it helps if you play in the center of your mouthpiece?!?!
Hope I helped!!
LD Bell
Trumpet Chick
2006-The Remaining