Hello! Sometimes (not always) I have this problem while playing lower notes: the musical sound is accompained by an undesired and non musical blowing sound, as if an excess of air pass throught the trumpet without generating tones. Is something like the sound of Miles Davis in "Mood" or "Circle" but involuntary, of course. Changing my embouchure is usually enough to make this sound dissapear but I'm not always succesfull. Somebody knows the origin of the problem? Thanks!