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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

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apply_patch

act imperative

Build a whole sound in one call: parameters, modulation routes and FX order applied together, then optionally saved and auditioned. Everything is validated before anything is applied and the patch lands all or nothing, using the same validation `update_parameters` and `set_modulation` use. `dryRun: true` reports what would change and touches nothing. `auditionNotes` RENDERS the result rather than playing it, so it needs no Start gesture. `rollbackId` in the result is the history version that undoes the whole call.

Input schema

Property	Type	Required	Description
`parameters`	array	no	What `update_parameters` takes: raw-unit values or choice labels.
`modulations`	object	no	Routes as `set_modulation`'s `add` resolves them. `replace: true` clears the matrix first, so `routes` becomes all of it; on its own it just clears.
`fxOrder`	array	no	All 8 effect ids exactly once, in processing order (default chorus, phaser, flanger, delay, reverb, eq, comp, fxdist). A missing, repeated or unknown id is an error, not a partial reorder.
`presetName`	string	no	Save the applied patch under this name, as save_preset would.
`auditionNotes`	array	no	Render these against the new patch and return its metrics: the render_audio step without a second round trip.
`dryRun`	boolean	no	Validate and report what would change, applying, saving and rendering nothing.

Raw JSON schema

{
  "type": "object",
  "properties": {
    "parameters": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "value": {
            "anyOf": [
              {
                "type": "number"
              },
              {
                "type": "string"
              }
            ]
          }
        },
        "required": [
          "id",
          "value"
        ],
        "additionalProperties": false
      },
      "description": "What `update_parameters` takes: raw-unit values or choice labels."
    },
    "modulations": {
      "type": "object",
      "description": "Routes as `set_modulation`'s `add` resolves them. `replace: true` clears the matrix first, so `routes` becomes all of it; on its own it just clears.",
      "properties": {
        "replace": {
          "type": "boolean"
        },
        "routes": {
          "type": "array",
          "maxItems": 32,
          "items": {
            "type": "object",
            "properties": {
              "source": {
                "type": "string",
                "description": "One of: env1, env2, env3, env4, env5, env6, lfo1, lfo2, lfo3, lfo4, lfo5, lfo6, lfo7, lfo8, velocity, keytrack, random, macro1, macro2, macro3, macro4, modwheel, pitchwheel, aftertouch."
              },
              "destination": {
                "type": "string",
                "description": "Moddable parameter id."
              },
              "depth": {
                "type": "number",
                "minimum": -1,
                "maximum": 1
              },
              "enabled": {
                "type": "boolean"
              }
            },
            "required": [
              "source",
              "destination",
              "depth"
            ],
            "additionalProperties": false
          }
        }
      },
      "additionalProperties": false
    },
    "fxOrder": {
      "type": "array",
      "minItems": 8,
      "maxItems": 8,
      "items": {
        "type": "string",
        "enum": [
          "chorus",
          "phaser",
          "flanger",
          "delay",
          "reverb",
          "eq",
          "comp",
          "fxdist"
        ]
      },
      "description": "All 8 effect ids exactly once, in processing order (default chorus, phaser, flanger, delay, reverb, eq, comp, fxdist). A missing, repeated or unknown id is an error, not a partial reorder."
    },
    "presetName": {
      "type": "string",
      "minLength": 1,
      "maxLength": 80,
      "description": "Save the applied patch under this name, as save_preset would."
    },
    "auditionNotes": {
      "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": "Render these against the new patch and return its metrics: the render_audio step without a second round trip."
    },
    "dryRun": {
      "type": "boolean",
      "description": "Validate and report what would change, applying, saving and rendering nothing."
    }
  },
  "additionalProperties": false
}