Audio Enhancement | Resemble

Enhance audio files by removing background noise, normalizing loudness, and applying studio-quality processing. The API is asynchronous — you submit an audio file, receive a tracking UUID, then poll for the result.

Workflow

Submit an audio file via the Create Enhancement endpoint.
Receive a UUID and poll the Get Enhancement endpoint until status is completed or failed.
Download the enhanced audio from the enhanced_audio_url.

Enhancement Engines

Engine	Default	Description
`v2`	✅	Noise removal, normalization, and studio sound. Recommended for most use cases.
`v1` (legacy)		Loudness normalization with configurable target levels and enhancement intensity. Will be sunset in a future release.

v2 Parameters

Parameter	Type	Default	Description
`remove_noise`	boolean	`true`	Remove background noise.
`normalize`	boolean	`true`	Normalize audio levels.
`studio_sound`	boolean	`true`	Apply studio-quality enhancement.

v1 Parameters (Legacy)

Parameter	Range	Default	Description
`enhancement_level`	`0.0` – `1.0`	`1.0`	Intensity of processing. Lower values apply lighter touch.
`loudness_target_level`	`-70` – `-5` LUFS	`-14`	Desired integrated loudness.
`loudness_peak_limit`	`-9` – `0` dBTP	`-1`	Maximum permitted peak. Lower values add headroom.

Accepted Audio Formats

WAV, MP3, M4A, MP4, OGG, AAC, FLAC. Maximum file size is 150 MB.

Polling Best Practices

Recommended interval: Poll every 5–10 seconds.
Timeout: Jobs timeout after approximately 5 minutes. If a job hasn’t completed by then, it will be marked as failed.
No retries: Failed jobs are not automatically retried. Submit a new request if needed.

Billing

Audio enhancement is a metered product billed per second of processed audio. If you exceed the limit, further requests return 403 Forbidden until the next billing cycle. Failed jobs are not billed.