Editing - Unifically

Edit an existing clip. Every operation returns a new clip and leaves the original untouched. All edits are free except Replace Section, which generates new audio.

Models

Model	What it does	Billed
`suno-ai/infill`	Regenerates a time range with new lyrics (replace section)	Yes
`suno-ai/crop`	Keeps only a range, or removes a range	No
`suno-ai/fade`	Adds a fade in, a fade out, or both	No
`suno-ai/speed`	Changes tempo, optionally keeping pitch	No
`suno-ai/reverse`	Reverses the clip	No
`suno-ai/concat`	Stitches an extended clip into one full song	No

Replace Section

Model: suno-ai/infill

Parameter	Type	Required	Description
`clip_id`	string	Yes	Clip to edit
`mv`	string	Yes	Model version, see Model Versions
`start_s`	number	Yes	Start of the section to replace, in seconds
`end_s`	number	Yes	End of the section to replace, in seconds
`lyrics`	string	No	Lyrics for the new section. Omit for instrumental
`context_start_s`	number	No	Start of the surrounding context. Default: `start_s`
`context_end_s`	number	No	End of the surrounding context. Default: end of the clip
`tags`	string	No	Genre/style tags
`title`	string	No	Title for the new clip
`make_instrumental`	boolean	No	Replace with instrumental only
`negative_tags`	string	No	Styles to avoid

Ranges that fall outside the clip are rejected before generation. Sections that start and end on bar boundaries blend best.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "suno-ai/infill",
    "input": {
      "clip_id": "1901ec96-72c6-4c26-8e56-91028ca6070d",
      "mv": "chirp-fenix",
      "start_s": 15,
      "end_s": 35,
      "lyrics": "Hello darkness, my old friend"
    }
  }'

Crop / Remove Section

Model: suno-ai/crop

Parameter	Type	Required	Description
`clip_id`	string	Yes	Clip to edit
`start_s`	number	Yes	Range start in seconds
`end_s`	number	Yes	Range end in seconds
`remove`	boolean	No	`false` keeps only the range (crop). `true` cuts the range out (remove section). Default: `false`
`title`	string	No	Title for the new clip

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "suno-ai/crop",
    "input": {
      "clip_id": "1901ec96-72c6-4c26-8e56-91028ca6070d",
      "start_s": 0,
      "end_s": 30
    }
  }'

Fade

Model: suno-ai/fade

Parameter	Type	Required	Description
`clip_id`	string	Yes	Clip to edit
`fade_in_s`	number	No*	Fade-in length in seconds from the start
`fade_out_s`	number	No*	Fade-out length in seconds before the end
`title`	string	No	Title for the new clip

* Provide at least one of fade_in_s or fade_out_s.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "suno-ai/fade",
    "input": {
      "clip_id": "1901ec96-72c6-4c26-8e56-91028ca6070d",
      "fade_in_s": 3,
      "fade_out_s": 5
    }
  }'

Speed

Model: suno-ai/speed

Parameter	Type	Required	Description
`clip_id`	string	Yes	Clip to edit
`speed_multiplier`	number	Yes	`0.25` to `4.0`
`keep_pitch`	boolean	No	Preserve pitch while changing tempo. Default: `false`
`title`	string	No	Title for the new clip

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "suno-ai/speed",
    "input": {
      "clip_id": "1901ec96-72c6-4c26-8e56-91028ca6070d",
      "speed_multiplier": 1.25,
      "keep_pitch": true
    }
  }'

Reverse

Model: suno-ai/reverse

Parameter	Type	Required	Description
`clip_id`	string	Yes	Clip to reverse
`title`	string	No	Title for the new clip

Get Full Song

Model: suno-ai/concat Extend returns only the new segment. Pass that extended clip here to receive one continuous song.

Parameter	Type	Required	Description
`clip_id`	string	Yes	ID of the extended clip

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "suno-ai/concat",
    "input": {
      "clip_id": "e69f5332-af8d-489e-b6ce-4a08a7f6429a"
    }
  }'

Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "processing"
  }
}

The completed task returns clips with the edited result, the same shape as Music Generation.

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.

​Models

​Replace Section

​Crop / Remove Section

​Fade

​Speed

​Reverse

​Get Full Song

​Response

Models

Replace Section

Crop / Remove Section

Fade

Speed

Reverse

Get Full Song

Response