Media

Stereo to Surround

Upmix a stereo file to a surround sound format

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

# 1) Upload each file first → returns { filePath }
curl -X POST 'https://api.elysiatools.com/upload/stereo-to-surround' \
  -F 'file=@/path/to/audioFile.ext'

# 2) Call the tool with the returned filePath values
curl -X POST 'https://api.elysiatools.com/en/api/tools/stereo-to-surround' \
  -F 'audioFile=/path/to/file.ext' \
  -F 'centerLevel=0.6' \
  -F 'rearLevel=0.5' \
  -F 'lfeLevel=0.4' \
  -F 'outputFormat=wav'

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/stereo-to-surround

Parameters

Name	Type	Required	Description
audioFile	fileupload required	Yes	—
centerLevel	range	No	Strength of the synthesized dialog/center channel.
rearLevel	range	No	Ambience sent to surround speakers.
lfeLevel	range	No	Amount of low end routed to the LFE channel.
outputFormat	select	No

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-stereo-to-surround": {
      "name": "stereo-to-surround",
      "description": "Upmix a stereo file to a surround sound format",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=stereo-to-surround",
      "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": "stereo-to-surround",
    "arguments": {
  "audioFile": "https://example.com/file.ext",
  "centerLevel": 0.6,
  "rearLevel": 0.5,
  "lfeLevel": 0.4,
  "outputFormat": "wav"
}
  }
}

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).

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