Media

Audio Spectral Filter

Filter audio based on its spectral content

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/audio-spectral-filter' \
  -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/audio-spectral-filter' \
  -F 'audioFile=/path/to/file.ext' \
  -F 'filterType=enhance' \
  -F 'lowFreq=100' \
  -F 'lowGain=0' \
  -F 'midFreq=1000' \
  -F 'midGain=3' \
  -F 'highFreq=5000' \
  -F 'highGain=2' \
  -F 'sharpness=0.5' \
  -F 'resonance=0.3' \
  -F 'mix=0.85' \
  -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-spectral-filter

Parameters

Name	Type	Required	Description
audioFile	fileupload required	Yes	—
filterType	select	No	Type of spectral filtering to apply. Each type has different frequency shaping characteristics.
lowFreq	number	No	Center frequency for low frequency band adjustments.
lowGain	range	No	Gain adjustment for low frequency band. Positive = boost, Negative = cut.
midFreq	number	No	Center frequency for mid frequency band adjustments.
midGain	range	No	Gain adjustment for mid frequency band. Positive = boost, Negative = cut.
highFreq	number	No	Center frequency for high frequency band adjustments.
highGain	range	No	Gain adjustment for high frequency band. Positive = boost, Negative = cut.
sharpness	range	No	How steep the filter transitions are. Higher values = more precise frequency targeting.
resonance	range	No	Adds feedback character to the filter. Higher values = more pronounced filter response.
mix	range	No	Balance between dry (original) and wet (filtered) signal.
outputFormat	select	No	—

File-type parameters must be uploaded first via POST /upload/audio-spectral-filter, 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-spectral-filter": {
      "name": "audio-spectral-filter",
      "description": "Filter audio based on its spectral content",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=audio-spectral-filter",
      "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-spectral-filter",
    "arguments": {
  "audioFile": "https://example.com/file.ext",
  "filterType": "enhance",
  "lowFreq": 100,
  "lowGain": 0,
  "midFreq": 1000,
  "midGain": 3,
  "highFreq": 5000,
  "highGain": 2,
  "sharpness": 0.5,
  "resonance": 0.3,
  "mix": 0.85,
  "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]