Inspect a local recording with a real frequency spectrum, peak readout and playback controls. An offline spectrum workbench, accessible peak and RMS readouts, a test-tone fixture and explicit play/pause controls. PopNow can add optional media after a quote; the core workflow runs locally.
- Uses PopNow for
- Images · Music & voice
- Needs
- Node.js
The skill is free. Optional AI images, video and sound are quoted for your approval before generation. API-key calls use your separate API balance in USD; generation through ChatGPT or Claude connected via OAuth/MCP uses your website credits.
v1.0.1 · Updated Oct 24, 2026 · 51 KB · Use it for personal and client work; please don't resell or share the package.
What you get
An offline spectrum workbench, accessible peak and RMS readouts, a test-tone fixture and explicit play/pause controls.
A validated local data model and self-contained HTML builder
Representative data, editable source and meaningful regression checks
Optional PopNow media with approval before generation
Good for
- Create a local audio inspection page that shows the dominant frequencies of my recording, with no uploads.
- Teams that need an editable local artifact with traceable inputs
Not for
- Not a mastering meter or medical hearing test; short windows trade frequency resolution for responsiveness.
- A hosted backend or synchronized multi-user service
How to use it
You say
Use the PopNow skill "Audio Spectrum Visualizer" (audio-spectrum-visualizer) for this: Create a local audio inspection page that shows the dominant frequencies of my recording, with no uploads.
Then try
Apply our actual data and explain any rejected fields.
Adapt the layout to our brand and quote optional PopNow media first.
What to have ready
- A user-selected audio file supported by the browser, or JSON {sampleRate,samples} with 32–2048 normalized PCM samples.
- Your final audience, labels and publication destination
- Owned assets and verified claims for any public version
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Questions
What input does this workflow need?
A user-selected audio file supported by the browser, or JSON {sampleRate,samples} with 32–2048 normalized PCM samples.
What does it calculate or validate?
Compute a Hann-windowed discrete Fourier transform for a reproducible snapshot. For playback, decode only the chosen local file and read actual Web Audio frequency bins. Calculate RMS and frequency resolution.
What is outside its scope?
Not a mastering meter or medical hearing test; short windows trade frequency resolution for responsiveness.
Can I use it without an API key?
Yes. The local template, validation and exports work without a key. PopNow media is optional and requires a quoted, approved API USD budget.