# Notes

> Gotchas and related packages.

## Notes & gotchas

- **No DOM, no events, no CSS.** WaveformGen produces JSON only. Async results come back exclusively via the `generatePeaks()` Promise.
- **Multi-channel audio** is mono-summed: each peak is the max amplitude across all channels for that bin.
- **`inline` ignores `bpm` and `markers`** — it emits only the raw peaks array.
- **Logs are prefixed `[WaveformGen]`** and can be fully silenced with `--quiet`.

## Related

- [Installation](/getting-started/installation/) — install the player itself.
- [Player options](/player/options/) — the `waveform`, `bpm`, and `markers` options this JSON feeds.
- [Markers](/player/data-attributes/#markers) — how the `markers` array renders.
- [WaveformBar](/extensions/bar/) — consuming the JSON via `data-wb-waveform`.