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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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render_audio

act imperative

Render a bounded note sequence and return `metrics` for it (plus `metricNotes`, which says how to read them). Offline by default: repeatable scheduling, far faster than real time, and available before the human starts audio. Each note names its pitch as `note` ("D2") or `midi` (38), never both. The fundamental is MEASURED from the render, never assumed from the note asked for, so a transposed or detuned patch shows up as a real number: `pitchCheck` puts the requested note and the measured one side by side.

Input schema

Property	Type	Required	Description
`notes`	array	yes	—
`duration`	number	no	—
`mode`	string	no	Default "offline". "realtime" captures the live AudioWorklet output and needs running audio; with no OfflineAudioContext an offline request falls back to real time via `renderModeFallback`.
`format`	string	no	Payload beside the metrics: "metrics" (default) or "url", a page-local blob URL of the rendered WAV a human can click to hear it. The URL costs a few dozen bytes; the samples themselves are never returned.

Raw JSON schema

{
  "type": "object",
  "properties": {
    "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
      }
    },
    "duration": {
      "type": "number",
      "exclusiveMinimum": 0,
      "maximum": 15
    },
    "mode": {
      "type": "string",
      "enum": [
        "offline",
        "realtime"
      ],
      "description": "Default \"offline\". \"realtime\" captures the live AudioWorklet output and needs running audio; with no OfflineAudioContext an offline request falls back to real time via `renderModeFallback`."
    },
    "format": {
      "type": "string",
      "enum": [
        "metrics",
        "url"
      ],
      "description": "Payload beside the metrics: \"metrics\" (default) or \"url\", a page-local blob URL of the rendered WAV a human can click to hear it. The URL costs a few dozen bytes; the samples themselves are never returned."
    }
  },
  "required": [
    "notes"
  ],
  "additionalProperties": false
}