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docs: the V4's sounder is an expansion module, and the slot was empty - #100

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docs: the V4's sounder is an expansion module, and the slot was empty#100
mclueppers wants to merge 1 commit into
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docs/v4-sounder-is-an-expansion

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The bench unit's silence at every drive had three candidate explanations and the case settled it: the buzzer pin runs to an expansion slot, the sounder is one of the modules that plug into it, and no module was fitted. The pin keeps being driven — that costs nothing empty and is what makes a module work the moment it arrives. The registry now says what kind of absent the sounder is.

The bench unit's silence at every drive had three candidate explanations
and the case settled it: the buzzer pin runs to an expansion slot, the
sounder is one of the modules that plug into it, and no module was
fitted. The pin keeps being driven — that costs nothing empty and is
what makes a module work the moment it arrives. The registry now says
what kind of absent the sounder is.
@github-actions github-actions Bot added the docs label Sep 3, 2026
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