> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mountsea.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Studio Fade In

> Apply fade-in and export

Apply fade-in and export. Equivalent to `/studio/edit` with `ops=[fadeIn]`. Coexists with legacy `/audio/fade`.

<Info>
  **Free** (0 credits). Poll [Get Task Status](/api-reference/suno/task) until `success`.
</Info>

## Parameters

| Field        | Type   | Required | Description                                                                                                                |
| ------------ | ------ | -------- | -------------------------------------------------------------------------------------------------------------------------- |
| `clip_id`    | string | Yes      | Source clip                                                                                                                |
| `start_s`    | number | Yes      | Fade-in start (seconds)                                                                                                    |
| `end_s`      | number | No       | Fade-in end                                                                                                                |
| `duration_s` | number | No       | Duration instead of `end_s` (default `2`)                                                                                  |
| `title`      | string | No       | New song title                                                                                                             |
| `beat`       | object | No       | Optional metronome export (`enabled`, optional `bpm` / `time_signature`). See [Studio Editing](/api-reference/suno/studio) |

## Example

```bash theme={null}
curl -X POST https://api.mountsea.ai/suno/v2/studio/fadeIn \
  -H "Authorization: Bearer your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "clip_id": "5a3c023f-d1ed-4a85-b61e-168dde2b6659",
    "start_s": 0,
    "duration_s": 2
  }'
```


## OpenAPI

````yaml POST /suno/v2/studio/fadeIn
openapi: 3.0.0
info:
  title: Suno AI
  description: API documentation for Suno AI
  version: 1.0.0
  contact: {}
servers:
  - url: https://api.mountsea.ai
    description: API Gateway
security: []
tags:
  - name: suno
    description: ''
  - name: suno/studio
    description: Studio Song Editor（与 audio/crop|fade|reverse 独立）
paths:
  /suno/v2/studio/fadeIn:
    post:
      tags:
        - suno/studio
      summary: Studio fadeIn
      description: 等价 /studio/edit ops=[fadeIn]。与老 audio/fade 并存。积分 0。
      operationId: ApiStudioController_fadeIn
      parameters: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/StudioFadeInDto'
      responses:
        '201':
          description: ''
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskIdDto'
      security:
        - bearerAuth: []
components:
  schemas:
    StudioFadeInDto:
      type: object
      properties:
        clip_id:
          type: string
          description: 原歌曲 clip_id
        start_s:
          type: number
          minimum: 0
          description: 淡入起始秒
          example: 0
        end_s:
          type: number
          minimum: 0
          description: 淡入结束秒
        duration_s:
          type: number
          minimum: 0
          description: 淡入时长秒（与 end_s 二选一，默认 2）
          default: 2
        title:
          type: string
          description: 新歌标题
        beat:
          description: Optional metronome export; omit for legacy behavior
          allOf:
            - $ref: '#/components/schemas/StudioBeatOptionsDto'
      required:
        - clip_id
        - start_s
    TaskIdDto:
      type: object
      properties:
        taskId:
          type: string
          description: task id. Use this id to query task status.
          example: 15c257ff-43f7-4678-bd41-202ad6b8488b
      required:
        - taskId
    StudioBeatOptionsDto:
      type: object
      properties:
        enabled:
          type: boolean
          description: Whether to enable beat grid + audible metronome on export
          example: true
        bpm:
          type: number
          minimum: 30
          maximum: 480
          description: >-
            Target BPM (30~480). Only when enabled=true; omit to keep
            project/source bpm
          example: 132
        time_signature:
          type: string
          pattern: /^\d+\/\d+$/
          description: Time signature like "4/4". Only when enabled=true; default "4/4"
          example: 4/4
          default: 4/4
      required:
        - enabled
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

````