Switching to tuba from trumpet
Hello everyone, as you may have read from the title, I am switching to tuba after playing the trumpet for almost 11 years (half-profesionally), but now due to medical reasons i need to switch to tuba (long story, i can only play a big mouthpiece). I've been practicing the tuba every day for over a month now.
As you might guess, I'm going through a sort of "backwards learning process" as i have no problems in the mid-high register (articulation is not a problem, neither is endurance - i've found i can play all day without getting tired, which is pretty amazing for someone coming from trumpet haha)
My main problem is the low register, i know i need to breathe more and blow a lot of slow, warm air, but i also hear and see everyone talking about "dropping your jaw", which seems very unnatural to me. When playing in the mirror i tend to pull my chin down when going up and dropping it when going lower seems to make it worse: it pulls my lips apart and they don't vibrate.
Do you think i need to learn the habit of "jaw' dropping, or is it fine if my embouchure barely moves at all and just slowly but surely expand my lower register with what i have?
I know it's a lot of theory to take in but i'm writing this while away from my horn so it'll be a couple of days before i can record myself playing to show what i mean.
Thank you in advance and have a good day!