Each standard backbore has a cylindrical section at the top where only the #27 reamer has passed. This cylinder is of varying lengths depending on the overall size of the backbore. (#1 has the longest cylinder, #9-12 the shortest). On Star backbores, this section is altered to be conical (tapered). Players report the following general characteristics:
Standard | Star | | Slots on each pitch are more defined with tighter center. | Slots are roomier - easier to lip pitch up or down without changing timbre or chipping attacks. | | Notes will "pop" (sound like du tongue) when slurring rapidly up a chromatic scale. | Notes tend to smoothly glide together on chromatic scale. | | Broadness of sound is limited in order to favor projection. | Produces broader, more blending sound, less projection. |
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