Text uses a basic built-in font — emoji & rich fonts aren't supported here; use
tools/helper.html for those (and for images).Display & underglow
Panels:
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LED effect:
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The LED effect runs on the underglow independently — e.g. Clock on the panels + Rainbow glow at the same time. Per-tube "Glow" works when the effect is Off or Solid.
Which tubes are populated
Tell the clock which slots have a working panel. Saved on the device. Slot 0 = far right.