Hello, My name is Daniel Hernandez and I am a euphonium player that is a Junior in high school in the State of Texas. I missed TMEA All-State by one placement this year, which was a major improvement from me last year. But I came on this website to ask one question. How to improve my tone. I feel that I have a decent tone in my opinion, but to me, I feel that I have a bit of air in my sound, and I don't know if its because of me, my mouthpiece, or my instrument. So, How do I make my tone improve and sound dark and rich?