| Same comment as above. Sometimes they can improve out of tune 1-3 and 1-2-3 notes.
Changing the mass of a trumpet will definately affect the response, efficiency and frequency spectrum that the horn produces.
Stating with certainty that adding mass at certain points will have certain results is a dicy proposition. It takes a LOT of heavy-duty mathematical analysis to be able to make those predictions with much accuracy. That's why most designers go at it experimentally to learn how adding/subtracting mass affects their horns.
However, exactly how adding/subtracting mass affects one trumpet design probably won't be totally repeatble on a different trumpet design. Its not black magic, even though it sounds like it. Its just that the physics involved make it very hard to predict exactly what effect changing the horn can have.
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