TTS Providers

Configure text-to-speech providers for different voices and languages.

Overview

The AI Flow service supports multiple TTS providers. Configure them per action in the tts field.

Supported Providers

• Azure Cognitive Services - 400+ voices in 140+ languages
• ElevenLabs - Ultra-realistic conversational voices

Azure Cognitive Services

Configuration

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hello!",
  "tts": {
    "provider": "azure",
    "language": "en-US",
    "voice": "en-US-JennyNeural"
  }
}

Popular Voices

Language	Voice Name	Gender	Description
en-US	en-US-JennyNeural	Female	Friendly, professional
en-US	en-US-GuyNeural	Male	Clear, neutral
en-GB	en-GB-SoniaNeural	Female	British, professional
en-GB	en-GB-RyanNeural	Male	British, friendly
de-DE	de-DE-KatjaNeural	Female	Professional, clear
de-DE	de-DE-ConradNeural	Male	Deep, authoritative

Full Voice List: See Azure TTS documentation

ElevenLabs

Configuration

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hello!",
  "tts": {
    "provider": "eleven_labs",
    "voice": "21m00Tcm4TlvDq8ikWAM"
  }
}

Voice IDs

The voice field is optional and accepts the ElevenLabs voice ID as a string. For example, "21m00Tcm4TlvDq8ikWAM" for "Rachel". If omitted, the first available voice will be used.

Minimal Configuration (uses default voice):

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hello!",
  "tts": {
    "provider": "eleven_labs"
  }
}

Available Voices

Voice Name	ID	Description
Rachel	21m00Tcm4TlvDq8ikWAM	Matter-of-fact, personable woman. Great for conversational use cases.
Drew	29vD33N1CtxCmqQRPOHJ	-
Clyde	2EiwWnXFnvU5JabPnv8n	Great for character use-cases
Paul	5Q0t7uMcjvnagumLfvZi	-
Aria	9BWtsMINqrJLrRacOk9x	Middle-aged female with African-American accent. Calm with hint of rasp.
Domi	AZnzlk1XvdvUeBnXmlld	-
Dave	CYw3kZ02Hs0563khs1Fj	-
Roger	CwhRBWXzGAHq8TQ4Fs17	Easy going and perfect for casual conversations.
Fin	D38z5RcWu1voky8WS1ja	-
Sarah	EXAVITQu4vr4xnSDxMaL	Young adult woman with confident, warm tone. Reassuring and professional.
Antoni	ErXwobaYiN019PkySvjV	-
Laura	FGY2WhTYpPnrIDTdsKH5	Young adult female with sunny enthusiasm and quirky attitude.
Thomas	GBv7mTt0atIp3Br8iCZE	Soft and subdued male voice, optimal for narrations or meditations
Charlie	IKne3meq5aSn9XLyUdCD	Young Australian male with confident and energetic voice.
George	JBFqnCBsd6RMkjVDRZzb	Warm resonance that instantly captivates listeners.
Emily	LcfcDJNUP1GQjkzn1xUU	-
Elli	MF3mGyEYCl7XYWbV9V6O	-
Callum	N2lVS1w4EtoT3dr4eOWO	Deceptively gravelly, yet unsettling edge.
Patrick	ODq5zmih8GrVes37Dizd	-
River	SAz9YHcvj6GT2YYXdXww	Relaxed, neutral voice ready for narrations or conversational projects.
Harry	SOYHLrjzK2X1ezoPC6cr	An animated warrior ready to charge forward.
Liam	TX3LPaxmHKxFdv7VOQHJ	Young adult with energy and warmth - suitable for reels and shorts.
Dorothy	ThT5KcBeYPX3keUQqHPh	-
Josh	TxGEqnHWrfWFTfGW9XjX	-
Arnold	VR6AewLTigWG4xSOukaG	-
Charlotte	XB0fDUnXU5powFXDhCwa	Sensual and raspy, ready to voice your temptress in video games.
Alice	Xb7hH8MSUJpSbSDYk0k2	Clear and engaging British woman, suitable for e-learning.
Matilda	XrExE9yKIg1WjnnlVkGX	Professional woman with pleasing alto pitch. Suitable for many use cases.
James	ZQe5CZNOzWyzPSCn5a3c	-
Joseph	Zlb1dXrM653N07WRdFW3	-
Will	bIHbv24MWmeRgasZH58o	Conversational and laid back.
Jeremy	bVMeCyTHy58xNoL34h3p	-
Jessica	cgSgspJ2msm6clMCkdW9	Young and playful American female, perfect for trendy content.
Eric	cjVigY5qzO86Huf0OWal	Smooth tenor pitch from man in his 40s - perfect for agentic use cases.
Michael	flq6f7yk4E4fJM5XTYuZ	-
Ethan	g5CIjZEefAph4nQFvHAz	-
Chris	iP95p4xoKVk53GoZ742B	Natural and real, down-to-earth voice great across many use-cases.
Gigi	jBpfuIE2acCO8z3wKNLl	-
Freya	jsCqWAovK2LkecY7zXl4	-
Brian	nPczCjzI2devNBz1zQrb	Middle-aged man with resonant and comforting tone. Great for narrations.
Grace	oWAxZDx7w5VEj9dCyTzz	-
Daniel	onwK4e9ZLuTAKqWW03F9	Strong voice perfect for professional broadcast or news story.
Lily	pFZP5JQG7iQjIQuC4Bku	Velvety British female voice delivers news with warmth and clarity.
Serena	pMsXgVXv3BLzUgSXRplE	-
Adam	pNInz6obpgDQGcFmaJgB	-
Nicole	piTKgcLEGmPE4e6mEKli	-
Bill	pqHfZKP75CvOlQylNhV4	Friendly and comforting voice ready to narrate your stories.
Jessie	t0jbNlBVZ17f02VDIeMI	-
Sam	yoZ06aMxZJJ28mfd3POQ	-
Glinda	z9fAnlkpzviPz146aGWa	-
Giovanni	zcAOhNBS3c14rBihAFp1	-
Mimi	zrHiDhphv9ZnVXBqCLjz	-

Choosing a Provider

Use Azure when:

• You need many languages (140+)
• You want consistent quality
• You need regional accents
• Budget is a concern

Use ElevenLabs when:

• You need the most natural voices
• Conversational quality is critical
• You're working with English/European languages
• You want distinct personalities

Examples

Python

# Azure voice
action = {
    'type': 'speak',
    'session_id': session_id,
    'text': 'Hello!',
    'tts': {
        'provider': 'azure',
        'language': 'en-US',
        'voice': 'en-US-JennyNeural'
    }
}

# ElevenLabs voice
action = {
    'type': 'speak',
    'session_id': session_id,
    'text': 'Hello!',
    'tts': {
        'provider': 'eleven_labs',
        'voice': '21m00Tcm4TlvDq8ikWAM'  # Rachel
    }
}

Next Steps

• Speak Action - How to use TTS
• Barge-In Configuration - Control interruptions