Sing the tone (say a low C) before you play it as if you were Luciano Pavarotti, then play the same note with the same air that you just sang with. I see lots of beginner kids that sound like the Aflac duck with a sinus infection and this tip helps them with the concept of putting the air THROUGH the horn, rather than INTO the horn. Play that low C as if you had to blow out the candles on a birthday cake with the wind that comes out of the bell. Got it?? Then... What if the cake was 5 feet away!? At first it will just be LOUDER, but you will learn to harness that raw energy and focus it on the center of the tone. To demonstrate this I SING the low C, then I buzz the low C with just my chops, then I buzz the low C on the mpc, then finally the cam note on the horn. The trumpet doesn't play the note, YOU DO... the trumpet amplifies it and defines the sound timbre... but if your BUZZ sucks and has no air support then it will be the same on the horn.