@_mark_ Mark, I would say you are approaching a topic that is worth learning even in the beginning. You are correct, the pedal tones are those that are not fundamentally on the horn. Learning to play them will enhance your breathing ability and control of your embouchure; both are items you will need for the upper register.
The easiest way I know of to learn a pedal is to start by playing the F# at the bottom of the trumpet range. Then, once you have the tone, bend it flat. This will involve relaxation of your embouchure, jaw and lips as you want the lips to flop at a lower frequency that needed at the higher registers. You'll find pedals take a lot of air! For the beginning, you can use the same fingerings as you would for the notes in the octave above. You will find you'll be using more lower lip as you go lower. My lowest range (which took a while) is the double pedal C and feels like it is almost all lower lip.
Pedals will likely never sound crisp and clear like the other notes on the horn and, like everything else, they take practice. Pedals are a great way to warm up (read Carmine Caruso books) and the learning books Total Range by Charles S. Peters and Systemic Approach to Daily Practice by Claude Gordon include pedals in the initial lessons. Have fun with them! They are worth your time.

@j-jericho LOL!!! You can be really mean.

@_mark_ Mark, I would say you are approaching a topic that is worth learning even in the beginning. You are correct, the pedal tones are those that are not fundamentally on the horn. Learning to play them will enhance your breathing ability and control of your embouchure; both are items you will need for the upper register.
The easiest way I know of to learn a pedal is to start by playing the F# at the bottom of the trumpet range. Then, once you have the tone, bend it flat. This will involve relaxation of your embouchure, jaw and lips as you want the lips to flop at a lower frequency that needed at the higher registers. You'll find pedals take a lot of air! For the beginning, you can use the same fingerings as you would for the notes in the octave above. You will find you'll be using more lower lip as you go lower. My lowest range (which took a while) is the double pedal C and feels like it is almost all lower lip.
Pedals will likely never sound crisp and clear like the other notes on the horn and, like everything else, they take practice. Pedals are a great way to warm up (read Carmine Caruso books) and the learning books Total Range by Charles S. Peters and Systemic Approach to Daily Practice by Claude Gordon include pedals in the initial lessons. Have fun with them! They are worth your time.

Lots of reasons for tinnitus. We used to have a CD at home that had a variety of frequencies one with tinnitus could listen to to find the right frequency of white noise. Like yours, mine seems to be getting louder.

As your doctor probably mentioned, there are some medical reasons associated with tinnitus that can be managed medically.

For sleep, I meditate myself to sleep. Sometimes I think the noise in my head will keep me awake but the meditation seems to work.

We haven't been practicing as a group here, either, but my hour or two a day on the horn generates enough internal vibration that I figure tinnitus is still getting stimulated. That and we have a macaw who can be even louder than I can.

Like you, I'd been wondering if tinnitus was common among brass players. I search the internet and didn't find anything specific.