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How to clone a character voice from recordings you have rights to with NPC Talk

Turn your own recording into reference clips, upload them and measure how close the voice sounds.

Authorization notice. NPC Talk is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Voice cloning. Cloning a real person's voice without their consent or the rights to the recording is what this use case must avoid, and the README says voice clips must never be committed or published.

Who it is forA modder making a character who needs a consistent cloned voice, using audio they have the rights to.

The problemA cloned voice can sound thin or off, and it is hard to tell whether the reference clip or the model is at fault.

The outcomeA voice folder with reference clips and mood clips on the server, and a likeness measurement that shows whether a setting helped.

What you need first

  • A game you own, ideally single-player (the README says never inject into online games with anti-cheat)
  • Git, Python 3.10+, uv and ffmpeg
  • A Modal account for the GPU voice server, with the NPCVOICE_TOKEN environment variable set
  • A fal key (FAL_KEY) for speech-to-text and the MCP server
  • A Cerebras key (CEREBRAS_API_KEY) for the NPC's lines
  • Optional: a TypeSafe key (TYPESAFE_API_KEY) for actions and spoken orders
  • Windows and the .NET SDK (8+) only if you follow the GTA V example

Steps

  1. Confirm you have the rights to the recording you plan to clone from.
  2. Make the reference set from your recording with npctalk voice make.
  3. Send the voice folder to the server with npctalk voice upload.
  4. Speak a test line in that voice with npctalk say and listen to the WAV.
  5. Run npctalk check before you share anything, so no voice clips or keys go out with the repo.

Prompt for your agent

In the NPCTalk repo at https://github.com/christos-antono/NPCTalk, use the voice-references and voice-likeness-eval skills to build a voice from <recording-path> that you have rights to. Expected output: a voices/<name> folder uploaded to the server and a WAV from `npctalk say`. Verify with `npctalk check` that no audio, transcripts or keys are staged for commit.

Caveat. The README's measured likeness numbers come from one character and ten test lines, so expect different results with your own voice and clips.

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