> ## Documentation Index
> Fetch the complete documentation index at: https://dripart-chore-sync-comfy-api-v2-spec-462120c.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# HeyGenTextToSpeechNode - ComfyUI Built-in Node Documentation

> Synthesize speech audio from text using HeyGen's Starfish TTS engine.

Synthesize speech audio from text using HeyGen's Starfish TTS engine. This node includes HeyGen's most popular voices across 17 languages.

## Inputs

| Parameter         | Description                                                                                                                          | Data Type | Required | Range                      |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------ | --------- | -------- | -------------------------- |
| `text`            | Text to synthesize (up to 5000 characters). The generated speech must be at least 1 second long.                                     | STRING    | Yes      | 1 to 5000 characters       |
| `voice`           | Voice to use (curated from HeyGen's most popular Starfish-compatible voices).                                                        | STRING    | Yes      | Multiple options available |
| `custom_voice_id` | Optional HeyGen voice ID. When set, overrides the voice selected above. The voice must support the Starfish engine (default: empty). | STRING    | No       | Any valid HeyGen voice ID  |
| `speed`           | Speech speed multiplier (default: 1.0).                                                                                              | FLOAT     | No       | 0.5 to 2.0 (step: 0.05)    |
| `ssml`            | Treat the text as SSML markup (for pauses, emphasis, and pronunciation control) (default: False).                                    | BOOLEAN   | No       | True / False               |
| `seed`            | Not sent to HeyGen; change it to force a re-run (default: 42).                                                                       | INT       | No       | 0 to 2147483647            |

## Outputs

| Output Name | Description                                                 | Data Type |
| ----------- | ----------------------------------------------------------- | --------- |
| `AUDIO`     | The synthesized speech audio generated from the input text. | AUDIO     |

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/HeyGenTextToSpeechNode/en.md)

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