PM_D‑1 Display
A display‑piece metronome — the pendulum is an RGB light bar that combines every lane's subdivisions & accents; a printed tempo scale with a sliding weight sets the tempo.
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The pendulum is the display: every lane's subdivisions & accents ride along the bar as
moving RGB light. Drag the weight up/down (or scroll) to set tempo — the scale is printed on the bar,
just like a wind‑up metronome. (No power switch: the real one starts when you lift it from its holder.)
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