This is a two part thread, to save space. I have been doing some experiments with my playing (with the help of my teacher of course) and he noticed I didn't really take a full breath, he told me to do that and it will over time reduce the amount of tension in my neck, because he used to play just like I do. He also noticed I play sort of planting my top lip on the mouthpiece first and sort of holding it there and putting my bottom lip underneath, I don't really know how to explain it any better. He told me to play a Low C, and pull the horn away from my face while sustaining the note and keeping my lips vibrating, and my lower lip will drop a bit and I should get the feel of where that is instead of 'cheating'. The thing is, with marching band this year, I've noticed on the move with fast drill with big steps I tend to use a lot of pressure, and that makes me extremely inconsistent. Last year during jazz band I was on third part for marching band, and played lead in Jazz band, being able to hit high C's consistently almost everyday with a decent sound. This year I got lead in marching band and can barely play A's above the staff with a good sound, but I can go higher sometimes. After marching band, I am really going to work everyday on using less pressure and less tension and force, but I've noticed that lately with this different approach when I am playing high and loud, air leaks out the side of my embochure, and I don't like 'tightening up' because that is the source of all my problems, so what should I visualize when I notice air leaking? Also, sometimes it takes me a long time to warmup, like when I first get my horn out I can barely support a middle C, and after a long warmup of lip slurs, I can play a high C (tone varies, like I said i've become inconsistent). The reason I am so serious about it now is because one of our players who is 2 years younger than me can pretty much do everything better than me, he sounds better, can play almost an octave higher, is very consistent, has better endurance. Also, for one of the trumpet features it is straight 8th notes in 6/8 at 152 BPM and as it got higher, it got up to high Bb's and that's when I would always slow down and sound airy, my teacher says to blow through, but it's easier said than down because it's not supposed to be very loud. I recently bought an Itouch and microphone, it's decent quality so if you need to hear what I sound like let me know and I can record and email you it, sometimes you can hear tension in my sound. Again, I know I said a lot, but i'm trying to be as detailed as possible with all the problems so that you guys can get a better idea of what's wrong, maybe you went through it and can tell me some stuff I can work on to help fix this? This is my top priority this year, so please tell me anything that will help!