valve alignment, most players choose a mouthpiece that is
bigger than it needs to be; When your horn is "shut down"
due to bad valve alignment, you need to use a larger
mouthpiece to feel comfortable. It could be a larger cup,
bore, backbore, or a combination. A larger mouthpiece is
harder to play.
With a Bob Reeves valve alignment, you can often use a more
efficient mouthpiece, and end up getting more sound, for