| YTR,
I've been thinking about you since the first couple of posts you put up. You are at a distinct disadvantage because you're an adult beginner and are not approaching this new trumpet thing with the child-like simplicity that is such an important part of learning music.
Kids go completely by sound and you're very concerned with the physical processes of playing. My advice is to stop trying to figure out what makes the car go. Put in the key, turn it, and drive. You don't have to be a mechanic to drive a car nor do you need any more knowledge about the trumpet other than what it sounds like for now. Leave all that other intellectual stuff for later.
Knowing what muscles are involved in trumpet playing is of no consequence to even an adult beginner. You need to hear someone play a low C several times and I'll bet nature will guide you if you have a good ear. If you don't have a good ear there's always piano which produces the tone for you.
Be a passive observer and enjoy the trumpet slowly, with patience. Endurance comes later with consistent practice and a good ear.
I wish you the best,
ML |