Please help. When playing a Getzen Severisen with a 1.5 c bach mouthpiece the tone is beautiful, however when I get into middle of the staff G through about E (in the staff) I have this strange sound. I would describe it as static (you primarily hear the note, but there is a subtle static sound. I can almost feel the static sound buzzing in my lips. It does the same thing with a 14a4a mouthpiece. I have three other olds and conn cornets that the strange background buzzing do not occur when I play. I had a repair done to the leadpipe and only noticed it after the repair, but I wonder if it was there before (can't quite recall now). It is only easily discernible when I play slow long tones. When playing fast, it is hardly noticable to me. When I played my friends Conn trumpet three weeks ago, I do not remember noticing the sound. It is defiinitely there. Any suggestions?