Configure Voice and Speech

Configure how your agent sounds. Choose a TTS provider, select a voice, and adjust speed. What you’ll learn: Provider selection, voice configuration, speed settings, and troubleshooting. Prerequisites: An agent created in Dasha BlackBox. See Create Your First Agent if you haven’t set one up yet.

Default voice: New agents use ElevenLabs Flash V2.5. Change voices anytime without affecting existing calls.

Overview

Component	What it does	Configuration
Text-to-Speech (TTS)	Converts agent responses to speech	Manual — choose provider, voice, speed
Speech-to-Text (STT)	Transcribes user speech to text	Automatic — platform selects optimal provider

Provider comparison

Provider	Best for	Speed range
ElevenLabs	Natural quality, customization	0.70x–1.20x
Cartesia	Emotions, wide speed range	0x–2.0x
Inworld	Character voices, gaming	0.80x–1.50x
LMNT	Consistent, lightweight	Fixed 1.0x

For detailed provider configuration, see TTS Providers Reference.

Configure voice

Open Voice & Speech tab

Navigate to agent creation or editing, then select the Voice & Speech tab.

Choose provider

Select your TTS provider from the dropdown.

Select voice

Browse by name, language, or gender. Click preview to hear samples.

Adjust speed

Set speech speed within provider limits. Default is 1.0x.

Save

Save your agent configuration.

Speed settings

Speed	Use case
0.7x–0.9x	Accessibility, complex information, legal disclosures
1.0x	General conversation, customer support
1.1x–1.5x	Time-sensitive scenarios, experienced users

Avoid speeds below 0.7x or above 1.5x — they sound unnatural.

Basic configuration

API example: TTS configuration

ttsConfig: {
  version: "v1",
  vendor: "ElevenLabs",
  voiceId: "zmcVlqmyk3Jpn5AVYcAL",
  model: "eleven_flash_v2_5",
  speed: 1.0
}

Troubleshooting

Issue	Solution
Voice sounds robotic	Try different voice or switch to ElevenLabs
Speech too fast/slow	Adjust speed in 0.05x increments
Pronunciation errors	Configure pronunciation dictionary via API

Next steps

TTS providers

Detailed provider configuration

Dashboard Testing

Test voice quality in the browser

LLM Configuration TTS Providers

⌘I

Introduction

Create

Test

Deploy

Monitor

Advanced Features

Troubleshooting

Overview

Provider comparison

Configure voice

Speed settings

Basic configuration

Troubleshooting

Next steps

TTS providers

Dashboard Testing

​Overview

​Provider comparison

​Configure voice

​Speed settings

​Basic configuration

​Troubleshooting

​Next steps

TTS providers

Dashboard Testing

Overview

Provider comparison

Configure voice

Speed settings

Basic configuration

Troubleshooting

Next steps