Media
Backing Vocal Width Expander
Turn a single vocal into a wide stereo harmony stack of 3, 5, or 7 transposed voices panned across the field.
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-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 'https://api.elysiatools.com/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'