Hey guys I had a quick question about a possible aperature problem that could happen. Well, my teacher moved me over to the valve trombone for symphonic band because we were short. I was one of the better trumpets in our class, I was wondering why she would do this? Also can playing on the trombone mouthpeice mess up my trumpet aperature? I go to play my trumpet after it and its quality decreases tremendously, but my range is helped.