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cosynth.vercel.app

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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

Tool inspector

play_notes

act imperative

Play a bounded note sequence live; start/duration relative, in seconds. Each note names its pitch as `note` ("D2") or `midi` (38), never both, and `pitches` in the result echoes back what each resolved to. Runs only once a human clicks CLICK TO START AUDIO (runtime.running=true); before that use `render_audio`, which needs no gesture. A repeated pitch retriggers. Example: {"notes":[{"note":"C4","velocity":0.8,"start":0,"duration":0.5}]}

Input schema

Property	Type	Required	Description
`notes`	array	yes	—

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
      }
    }
  },
  "required": [
    "notes"
  ],
  "additionalProperties": false
}