Yes I suppose you do have a point. And yes, I already do know pretty much what I have to do to get the higher range. One of my problems is that I need to play with more air, and I'm in the process of fixing that. However, I managed to reach a high D today! I learnt a new technique/exercise for trumpet playing, I suppose you could say it is a 'pre-warm-up' exercise. It's called the pencil technique. You stick the tip of a pencil in your mouth and hold it there for 5 minutes firmly. Your lip muscles burn and get really hot. It works them out and makes them ready for higher note playing. In addition the next time you play your lips will be stronger, and therefore you'll be able to hold the pencil there more firmly and for longer. Anybody else heard of this?