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Timeline

Live scope

Playhead

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Vrms

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Frequency

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Time error

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Tile loading

Show tile boundaries

Each zoom level is cut into fixed tiles on a fixed time grid. Pans reuse cached tiles, and tiles well in the past never change, so the browser caches them. While a finer tile loads, its lane draws from a coarser one it already has.

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History

min / mean / max

vs grid clock

Events

Only events in view

Scope

Spectrum at playhead

plm2 by natalie

Controls

Drag	Pan
`Shift` drag, or drag the ruler	Select a range
Wheel	Zoom around the playhead (or the cursor if the playhead is off screen)
`Shift` wheel, sideways scroll	Pan
Click	Move the playhead
Double-click	Zoom to selection, or zoom in
Click an event cluster	Zoom into it
`J` `K` or `Down` `Up`	Older / newer event
`Left` `Right`	Pan
`+` `-`	Zoom in / out
`Z`	Zoom to selection or selected event
`0`	Show all history
`Space` / `L` / `F`	Play / loop / follow live
`Esc`	Clear selection

Notes

The lanes show the stored readings: Vrms and frequency from the tsdb, and the accumulated time error. All times are UTC.
Data arrives as small binary tiles on a fixed grid. Every lane loads on its own and sharpens as finer tiles land. The network button in the header shows what has been fetched.
Audio for playback, the scope, the spectrum and clip downloads comes from the hourly archive when it covers that time, and from an event's own snapshot once the archive has expired.
The bar under the history strip marks the span the hourly audio archive still covers.