I am normally a trumpet player obviously, but was told to audition for lead mellophone at Carolina Crown. I have more trouble playing on the move on mellophone, because the notes are a 4th lower than on my normal Bb trumpet. Is it normal to have more feet in the sound the lower you play? I sound significantly better while playing in the upper register on the move than the lower register. A friend of mine commented on a video of me marching and playing and noticed I cracked a lot of notes in one spot, and he said I might be "tonguing through the embochure" and that caused my cracked notes. Thoughts on this, and how to improve my sound on the move on mellophone?