JSON content: lyrics, visualizer, DSP, locale

Four kinds are mostly JSON under content/. Index → Workshop SDK.

Lyrics scene (lyrics-style)

The host owns slots; your JSON places them.

1. init .\cinema --recipe cinema-lyrics
2. Edit content/lyrics-style.json — type: "slot", slot: "title", etc.
3. If hostChrome.miniPlayer is hidden, include play-toggle (and usually prev/next).
4. npm run check → npm run dev

Common slots: cover, title, artist, lyrics, current-line, spectrum, play-toggle, previous-track, next-track, …

node .\bin\echo-workshop-sdk.mjs guide lyrics

Visualizer (visualizer-preset)

• Styles: bars, wave, radial only — no particles
• Palette: 1–8 unique #rrggbb; barCount 8–128
• init .\viz --recipe radial-visualizer

DSP (dsp-preset)

Official 31-band layout only. Gain -12..12, Q 0.1..12, preamp -12..6.

init .\eq --recipe vocal-eq — edit content/dsp.json, then npm run check.

Locale pack (locale-pack)

Extra string tables for languages ECHO does not ship.

init .\lzh --recipe wenyan-locale — edit content/locale.json; missing keys fall back to a built-in locale.

Audio plug-in profile

Configuration notes for local VST adapter setup — not the VST binary itself.

init .\vst-help --kind audio-plugin-profile

Comparison

Kind	Entry file	Where users apply it
lyrics-style	lyrics-style.json	Lyrics page / scene
visualizer-preset	visualizer.json	Player visualizer
dsp-preset	dsp.json	EQ preset
locale-pack	locale.json	Language settings

Themes → theme tutorial. Plug-ins → plug-in tutorial.