Audio Looper

Create seamless loops from an audio clip

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-looper' \
  -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-looper' \
  -F 'audioFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'loopStart=0' \
  -F 'loopLength=2' \
  -F 'repetitions=4' \
  -F 'crossfade=0.1' \
  -F 'tempoSync=false' \
  -F 'pitchPreserve=true' \
  -F 'mix=1' \
  -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-looper

Parameters

Name	Type	Required	Description
audioFile	fileupload required	Yes	—
loopStart	number	No	Starting point for the loop segment within the audio file.
loopLength	range	No	Duration of each loop repetition. Shorter values = faster rhythmic patterns.
repetitions	range	No	Number of times the loop segment repeats. Higher values = longer loop sequences.
crossfade	range	No	Smooth transition between loop repetitions. Helps eliminate audible seams.
tempoSync	checkbox	No	Attempt to match loop length to musical tempo. May affect audio quality.
pitchPreserve	checkbox	No	Maintain original pitch when adjusting tempo. When off, tempo changes affect pitch.
mix	range	No	Balance between dry (original) and wet (looped) signal.
outputFormat	select	No	—

File-type parameters must be uploaded first via POST /upload/audio-looper, 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-looper": {
      "name": "audio-looper",
      "description": "Create seamless loops from an audio clip",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=audio-looper",
      "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-looper",
    "arguments": {
  "audioFile": "https://example.com/file.ext",
  "loopStart": 0,
  "loopLength": 2,
  "repetitions": 4,
  "crossfade": 0.1,
  "tempoSync": false,
  "pitchPreserve": true,
  "mix": 1,
  "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]