LLM MetaSound

JSON-Driven MetaSound Asset Generator for Unreal Engine 5.

Generate complete UMetaSoundSource and UMetaSoundPatch assets from JSON (.llmmetasound files, in Plugins/LLMMetaSound/Examples/) with auto-connected nodes and type-safe edges — no manual MetaSound editor work required.

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Features

• One JSON, Complete Audio Graph — Nodes, edges, and connections generated from a single .llmmetasound file
• LLM-First Design — AI outputs JSON directly, no MetaSound editor knowledge required
• Bidirectional Conversion — JSON → UMetaSoundSource/Patch, UMetaSoundSource/Patch → JSON
• Builder Subsystem Integration — Uses UE5 MetaSound Builder Subsystem for robust asset creation
• Auto-Connect — Automatically connects OnPlay trigger and audio source nodes
• Type Safety — Validates vertex types before creating edges, prevents invalid connections
• 6 Example Files — TriangleSub, SawDiscord, SquareBass, SquareLead, TrianglePad, NoiseBurst
• Full MetaSound Support — Works with UMetaSoundSource and UMetaSoundPatch

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Quick Start

1. Menu → Tools → LLM MetaSound
2. Load a .llmmetasound file or paste JSON
3. Click Generate MetaSound
4. The generated MetaSound asset opens automatically

{
  "Metadata": {
    "NodeName": "MySound",
    "NodeType": "MetasoundSource",
    "MetasoundDescription": "My custom sound"
  },
  "Inputs": [],
  "Outputs": [],
  "Nodes": [
    { "NodeID": 1, "ClassName": "Triangle", "Name": "Osc1", "InputDefaults": { "Frequency": { "LiteralType": "Float", "AsFloat": 440.0 } } },
    { "NodeID": 2, "ClassName": "Envelope Follower", "Name": "AmpEnv", "InputDefaults": { "Enable": { "LiteralType": "Boolean", "AsBool": true } } }
  ],
  "Edges": [
    { "FromNodeID": 1, "FromVertexID": 0, "ToNodeID": 2, "ToVertexID": 1 }
  ]
}

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Version Info

Item	Value
Plugin Version	1.0.0
Engine	UE 5.7+
Modules	LLMMetaSoundEditor (Editor)
Publisher	YominUnreal
Required Plugins	Metasound (engine)