Final answer:
The sackbut is the ancestor of the modern trombone, utilizing a slide mechanism to control pitch, distinguishing it from other brass instruments.
Explanation:
The ancestor of the modern trombone is the sackbut. Unlike other brass instruments that use valves, the trombone player manually adjusts pitch by moving a slide. The sackbut, a predecessor to the modern trombone, shares similarities in design and function.
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