I've posted about problems with my embrochure. I found on the net the problem and a possible solution, here goes: This is what happened to me ( not me, skankin'dan but someone on the net with the same problem).....my mouthpeice slipped. originally it was in a good position right on the center of the lips....a little to the right. ( everyone is a little different ) but.....after a combination of too much playing...too much pressure among other things it eventually slipped down and i was playing on the "red meat" meaning just a slivver of teh inside of my lip. You cant bget much vibration out of that. so i had to replace my mouthpeice( I didn't i kept the same one). i Tried a bunch of complicated excersises, but after asking some profesors at Capital Univercity, the Eastman school of music, and some local trumpet players, they all said the best thing to do was just to not touch the trumpet for at least 3 weeks, and than start from scratch. i did that, and i`ve never felt better. Not saying this is your problem, but a break off the trumpet for a while and a compleate restart could fix eveything. So I don't know if i should try this... stop playing for 3 weeks and start over again. With school coming up in 2.5 weeks i may be able to at least stop for 2 weeks and start again... can someone give me advice on what to do?