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Wouldn't your bass trumpet piece provide a useful option for at least a few alto trombone players?

It might prove useful on ultra-peashooter valve trombones, as well.

bloke wrote:- a specific-to-cimbasso mouthpiece which pleases me (smaller than most all so-called "F tuba" mouthpieces, ~yet~ larger than a typical contrabass trombone mouthpiece)

This one intrigues me, if for no other reason than I'm curious how the specs compare to one of the mouthpieces I use on my F.

Joe, I’d be interested in a cimbasso mouthpiece as you describe, but as you note I’d need the standard shank size. Even more, I’d love it to be modular and interface with your other stuff (to the extent possible).