# Isolate voice from background noise

Only the voice stays: the noise, music, effects, and chatter behind it go.

## What isolating a voice means

Isolating a voice means keeping each person who speaks and taking out everything around them. The example above is an interview with a rugby coach, recorded outdoors at the ground right after a match. The original has the sound of the ground all around him. The isolated version keeps only his voice, as the microphone caught it.

For the best results next time, keep the microphone close to the speaker and away from loud sounds such as traffic. The quieter the recording, the less there is to take out, and the better the voice sounds. Outdoors, put a windscreen on the microphone to keep the wind out.

Tool: Remove noise (`remove_noise`). The same tool's other pages: https://audo.ai/noise-removal.md, https://audo.ai/remove-noise-from-video.md, https://audo.ai/remove-music-from-video.md, https://audo.ai/remove-static.md. Price: 3 credits a minute of input for whole files, charged only when a job succeeds.

## Free API

```bash
curl -F file=@interview.mp4 https://audo.ai/api/try/remove-noise -D response.headers -o response.body
```

Read response.headers and response.body before naming media. Handle 202, 200 JSON and errors with the complete response client at https://audo.ai/docs/api#responses.

Free for the first minute of each file, 3 times a day per person, with no key or account. Uploads up to 100 MB, 2 at once from one address. The response is the result itself; a job that runs longer than about 30 seconds returns 202 with a link to check on it. With an API key (`-H "Authorization: Bearer $AUDO_API_KEY"`), omitting free runs the whole file with credits if the balance covers it, otherwise the free portion if quota remains. Set free=true to prohibit spending; for paid whole files use free=false with an approved positive max_credits. A free result cut short comes with finishUrl (and the Audo-Finish-Url header when the response is the file itself): give it to the person, who pays there (from $5, no sign-up), and the whole file runs; keep checking the status link, whose finishedBy names the whole-file job and its own status link. Details: https://audo.ai/docs/api.md

## Options

Form fields with the same names as the MCP tool's inputs:

- `noise_reduction`: How much of the noise to turn down, as a percentage. 100 turns down all it can; lower values keep some of the background. Default 100.
- `auto_volume`: Sets the whole file to -16 LUFS with one gain, and limits peaks to -1 dBTP. It doesn't balance loud and quiet speakers. Default true.
- `output_format`: The result's format: same (as the input; a video stays a video), wav, mp3, m4a, or flac. Default same.

## Languages

Any language: it works on the sound, not the words.

## From an assistant (MCP)

Add https://audo.ai/mcp and sign in (setup for each assistant: https://audo.ai/setup.md). The tool is `remove_noise`:

> Turns down background noise, hiss, hum, and room noise behind speech, keeping the speaker's real voice: it filters the recording and adds no sound of its own. Then sets the file to -16 LUFS. Made for voices: music and other sounds are turned down too. Works on video. Use it when the voice is fine but there's noise behind it. Not for echo, phone, or damaged audio (enhance_voice). Set free to true to do the first minute at no cost, up to 3 times a day; otherwise it costs 3 credits a minute, charged only if the job succeeds. Returns job_id; then call get_job.

Example: "Use Audo to isolate the voice in interview.mp4 and remove everything behind it."

## More

- Every tool: https://audo.ai/llms.txt
- OpenAPI: https://audo.ai/api/openapi.json
- This page for people: https://audo.ai/voice-isolator