Audio Granulator

Apply granular synthesis to the audio

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/audio-granulator' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"audioFile.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/audio-granulator' \
  -F 'audioFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'grainSize=50' \
  -F 'density=30' \
  -F 'spray=20' \
  -F 'pitch=1' \
  -F 'randomness=0.4' \
  -F 'overlap=0.3' \
  -F 'mix=0.75' \
  -F 'outputFormat=mp3'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/audio-granulator

Parameters

Name	Type	Required	Description
audioFile	fileupload required	Yes	—
grainSize	range	No	Duration of each audio grain. Smaller values = more fragmented texture.
density	range	No	How many grains per second. Higher values = denser, more continuous sound.
spray	range	No	Random timing variation between grains. Higher values = more scattered, unpredictable texture.
pitch	range	No	Pitch modification of grains. Can create harmonic or dissonant clusters.
randomness	range	No	Overall randomization of grain parameters. Higher values = more chaotic, evolving texture.
overlap	range	No	Amount of overlap between grains. Higher values = smoother, more blended texture.
mix	range	No	Balance between dry (original) and wet (granular) signal.
outputFormat	select	No	—

File-type parameters must be uploaded first via POST /upload/audio-granulator, then the returned filePath is passed to the corresponding file field.

Response format

File result

JSON

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-audio-granulator": {
      "name": "audio-granulator",
      "description": "Apply granular synthesis to the audio",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=audio-granulator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "audio-granulator",
    "arguments": {
  "audioFile": "https://example.com/file.ext",
  "grainSize": 50,
  "density": 30,
  "spray": 20,
  "pitch": 1,
  "randomness": 0.4,
  "overlap": 0.3,
  "mix": 0.75,
  "outputFormat": "mp3"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

File parameters accept a public file URL only (https://…). Local paths, data: URIs, and Base64 strings are not supported.

Questions or issues? Contact [email protected]