> ## Documentation Index
> Fetch the complete documentation index at: https://developers.myhero.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Synthesize conversational speech

> Generates text-to-speech audio in a conversational style and returns the result as a binary `audio/mpeg` stream.

Accepts `text` (max 900 chars), an optional `style` string (defaults to "friendly and natural"), and an optional `voice`.

Unlike `synthesizeSpeech`, the response body is raw MP3 bytes, not JSON.



## OpenAPI

````yaml post /tts/conversational
openapi: 3.1.0
info:
  title: HERO API
  version: current
  description: |-
    The HERO REST API.

    See https://developers.myhero.so for the rendered docs.
servers:
  - url: https://app.myhero.so
security: []
paths:
  /tts/conversational:
    post:
      tags:
        - TTS
      summary: Synthesize conversational speech
      description: >-
        Generates text-to-speech audio in a conversational style and returns the
        result as a binary `audio/mpeg` stream.


        Accepts `text` (max 900 chars), an optional `style` string (defaults to
        "friendly and natural"), and an optional `voice`.


        Unlike `synthesizeSpeech`, the response body is raw MP3 bytes, not JSON.
      operationId: synthesizeConversational
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                text:
                  type: string
                  minLength: 1
                  maxLength: 900
                style:
                  type: string
                voice:
                  type: string
              required:
                - text
      responses:
        '200':
          description: Audio stream
          content:
            audio/mpeg:
              schema:
                type: string
                format: binary
        '400':
          description: Validation error
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: |-
                      Error class name (e.g.

                      ValidationError, NotFound)
                  message:
                    type: string
                    description: Human-readable error message
                  details:
                    type: array
                    items: {}
                required:
                  - error
                  - message
      security:
        - bearerAuth: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: HERO personal access token

````