A lot of the sound comes from the material the pot is made from, in conjunction with the call surface/ in conjunction with the sound board/ down to the type and amount of glue used to glue it all up. The thickness of the walls makes a difference as well as the thickness and height of the pedestal the sound board sits on. And the thickness/quality of the sound board makes a difference as well. Just like a trumpet call, they all look similar from the outside, but the internals and knowledge of the builder is what makes the difference.
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