Media
Turn a single vocal into a wide stereo harmony stack of 3, 5, or 7 transposed voices panned across the field.
Call this tool from your code in three languages.
# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'http://127.0.0.1:3003/api/upload/presign/audio-backing-vocal-width' \
-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 'http://127.0.0.1:3003/en/api/tools/audio-backing-vocal-width' \
-F 'audioFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
-F 'stackSize=5' \
-F 'spread=wide' \
-F 'haasDelayMs=12' \
-F 'includeSubOctave=true' \
-F 'backingLevel=70' \
-F 'preserveFormant=true' \
-F 'normalizeLoudness=true' \
-F 'outputFormat=mp3'Send a POST request with your inputs as JSON. File parameters require a separate upload first.
POST http://127.0.0.1:3003/en/api/tools/audio-backing-vocal-width| Name | Type | Required | Description |
|---|---|---|---|
| audioFile | fileupload required | Yes | — |
| stackSize | select | Yes | — |
| spread | select | Yes | — |
| haasDelayMs | number | No | — |
| includeSubOctave | checkbox | No | — |
| backingLevel | number | No | — |
| preserveFormant | checkbox | No | — |
| normalizeLoudness | checkbox | No | — |
| outputFormat | select | No | — |
File result
{
"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)"
}Add this tool to your Model Context Protocol server so AI agents can list and call it.
Add this block to your MCP client configuration:
{
"mcpServers": {
"elysiatools-audio-backing-vocal-width": {
"name": "audio-backing-vocal-width",
"description": "Turn a single vocal into a wide stereo harmony stack of 3, 5, or 7 transposed voices panned across the field.",
"baseUrl": "http://127.0.0.1:3003/mcp/sse?toolId=audio-backing-vocal-width",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}After connecting to the SSE endpoint, list the exposed tools:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Invoke the tool by its id, passing arguments built from its parameters:
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "audio-backing-vocal-width",
"arguments": {
"audioFile": "https://example.com/file.ext",
"stackSize": 5,
"spread": "wide",
"haasDelayMs": 12,
"includeSubOctave": true,
"backingLevel": 70,
"preserveFormant": true,
"normalizeLoudness": true,
"outputFormat": "mp3"
}
}
}Questions or issues? Contact [email protected]