helix-stadium-mcp

An MCP server that lets an AI assistant read, explain, and (soon) edit Line 6 Helix Stadium .hsp guitar presets from natural language.

Disclaimer: helix-stadium-mcp is an independent, unofficial tool. It is not affiliated with, authorized, maintained, sponsored, or endorsed by Line 6 or Yamaha Guitar Group. "Line 6," "Helix," and "Helix Stadium" are trademarks of their respective owners, used here only nominatively to describe compatibility.

What it does

• Reads .hsp presets losslessly (byte-exact round-trip).
• Explains a preset in plain English — the full signal chain of each path with friendly model names, on/off state, per-snapshot & footswitch tags, and parameters in real units (dB, Hz, ms, %).
• Diffs snapshots — exactly what changes between two snapshots (e.g. Rhythm vs Lead), in real units.
• Browses the model catalog (list / describe / search models).
• Validates a preset's structure (and, with the catalog, its model ids and controller sources).

Editing, generation, and setlist tooling are on the roadmap.

Requirements

• Helix Stadium installed (Windows confirmed; macOS support in progress). The server reads the model catalog from your own install at runtime — no Line 6 content is bundled or redistributed.
• Python 3.10+.

Install & configure

uvx twelvetake-helix-stadium-mcp serve      # or: pipx run twelvetake-helix-stadium-mcp serve

Add to your MCP client (e.g. Claude Desktop mcpServers):

{
  "mcpServers": {
    "helix-stadium": {
      "command": "uvx",
      "args": ["twelvetake-helix-stadium-mcp", "serve"]
    }
  }
}

If the catalog isn't auto-detected, set HELIX_STADIUM_RES to your install's res/ folder (the one containing P35ModelCatalog.json). Check detection with helix-stadium-mcp doctor.

Tools (v1)

read_preset · explain_preset · diff_snapshots · list_models · describe_model · search_models · validate_preset · detect_install

License

MIT © TwelveTake Studios LLC. See LICENSE.