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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.

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Overview

ComponentWhat it doesConfiguration
Text-to-Speech (TTS)Converts agent responses to speechManual — choose provider, voice, speed
Speech-to-Text (STT)Transcribes user speech to textAutomatic — platform selects optimal provider

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Provider comparison

ProviderBest forSpeed range
ElevenLabsNatural quality, customization0.70x–1.20x
CartesiaEmotions, wide speed range0x–2.0x
InworldCharacter voices, gaming0.80x–1.50x
LMNTConsistent, lightweightFixed 1.0x
For detailed provider configuration, see TTS Providers Reference.

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Configure voice

1

Open Voice & Speech tab

Navigate to agent creation or editing, then select the Voice & Speech tab.
2

Choose provider

Select your TTS provider from the dropdown.
3

Select voice

Browse by name, language, or gender. Click preview to hear samples.
4

Adjust speed

Set speech speed within provider limits. Default is 1.0x.
5

Save

Save your agent configuration.

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Speed settings

SpeedUse case
0.7x–0.9xAccessibility, complex information, legal disclosures
1.0xGeneral conversation, customer support
1.1x–1.5xTime-sensitive scenarios, experienced users
Avoid speeds below 0.7x or above 1.5x — they sound unnatural.

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Basic configuration

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

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Troubleshooting

IssueSolution
Voice sounds roboticTry different voice or switch to ElevenLabs
Speech too fast/slowAdjust speed in 0.05x increments
Pronunciation errorsConfigure pronunciation dictionary via API

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Next steps

TTS providers

Detailed provider configuration

Dashboard Testing

Test voice quality in the browser