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A synthesizer you control by talking to AI.

First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com

Answer 8 · Act 14 · Transact 2 · Score: Not yet scored

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compare_audio

act imperative

Step 2 of matching a target sound: the signed, per-dimension error between the reference and your sound (`diff`). It also returns ranked moves in this synth's parameter ids (`diff.actions`) and the `comparison` score. It renders the candidate first by default, at the reference's own detected pitch and duration, releasing the note a tail before the buffer ends so its decay is measurable — never an octave-off render whose scalars still look plausible. Falls back to the last render or the live scope with `autoRender: false`, and refuses a silent scope rather than scoring against silence.

Input schema

Property	Type	Required	Description
`autoRender`	boolean	no	Default true when the reference has a pitch: render at that pitch and duration first. False compares the last render, or the live scope.
`notes`	array	no	Notes for that render, when the reference's own pitch is not what you want.
`duration`	number	no	Render seconds; defaults to the reference's duration.
`format`	string	no	Default "text": the diff as a compact table, and a summary in the strict sense — the arrays that table restates (`envelopeDb`, `bandsDb`, `spectralWindows`, `metricNotes`) are dropped from both metrics objects, cutting about a third off the response and more as `windows` rises. "json" returns everything whole.
`maxActions`	integer	no	Ranked moves, default 5.

Raw JSON schema

{
  "type": "object",
  "properties": {
    "autoRender": {
      "type": "boolean",
      "description": "Default true when the reference has a pitch: render at that pitch and duration first. False compares the last render, or the live scope."
    },
    "notes": {
      "type": "array",
      "minItems": 1,
      "maxItems": 128,
      "items": {
        "type": "object",
        "properties": {
          "midi": {
            "type": "integer",
            "minimum": 0,
            "maximum": 127,
            "description": "Pitch as a number. Pass this or `note`, never both."
          },
          "note": {
            "type": "string",
            "minLength": 2,
            "maxLength": 5,
            "description": "Pitch as a name with an octave: \"C4\" is MIDI 60, \"D2\" is 73.4 Hz. Sharps \"#\", flats \"b\". Pass this or `midi`, never both."
          },
          "velocity": {
            "type": "number",
            "minimum": 0,
            "maximum": 1
          },
          "start": {
            "type": "number",
            "minimum": 0
          },
          "duration": {
            "type": "number",
            "exclusiveMinimum": 0
          }
        },
        "required": [
          "velocity",
          "start",
          "duration"
        ],
        "oneOf": [
          {
            "required": [
              "midi"
            ]
          },
          {
            "required": [
              "note"
            ]
          }
        ],
        "additionalProperties": false
      },
      "description": "Notes for that render, when the reference's own pitch is not what you want."
    },
    "duration": {
      "type": "number",
      "exclusiveMinimum": 0,
      "maximum": 15,
      "description": "Render seconds; defaults to the reference's duration."
    },
    "format": {
      "type": "string",
      "enum": [
        "json",
        "text"
      ],
      "description": "Default \"text\": the diff as a compact table, and a summary in the strict sense — the arrays that table restates (`envelopeDb`, `bandsDb`, `spectralWindows`, `metricNotes`) are dropped from both metrics objects, cutting about a third off the response and more as `windows` rises. \"json\" returns everything whole."
    },
    "maxActions": {
      "type": "integer",
      "minimum": 0,
      "maximum": 20,
      "description": "Ranked moves, default 5."
    }
  },
  "additionalProperties": false
}