Your AI agent's voice is how customers experience your brand over the phone. This guide covers how to choose a voice, configure languages, and fine-tune pronunciation.

Choosing a Voice

  1. Go to Agent → Voice & Languages
  2. Browse available voices using the Female and Male tabs
  3. Click Preview on any voice card to hear a sample
  4. Select the voice you want to use Each voice has a name, accent, and language. Pick one that matches your brand's tone — whether that's warm and friendly or polished and professional.

Adjusting Voice Settings

Below the voice selection, you can fine-tune how your agent speaks:

💡 Tip: Start with the default settings and adjust after a few test calls. Most businesses find the defaults work well.

Setting Up Languages

Setting What It Does Range
Speech Speed How fast your agent talks 0.7x (slower) to 1.2x (faster)
Turn Timeout How long to wait for the caller to respond before the agent continues 1–10 seconds
Max Call Duration Maximum length of a single call ~2 to 20 minutes
Silence End Call Automatically end the call after prolonged silence On / Off

Speako supports 29+ languages including English, French, Spanish, Chinese, Japanese, Arabic, and many more.

Primary Language

Your agent's primary language is the default language it speaks. To change it:

  1. Go to Agent → Voice & Languages
  2. Find the Language section
  3. Select your preferred primary language

Multiple Languages

If your customers speak different languages, you can enable automatic language detection:

  1. Toggle on Language Detection
  2. Add additional languages from the language list
  3. Assign a specific voice for each language When enabled, your agent detects the caller's language and switches automatically.

Adding Pronunciation Rules

If your agent mispronounces a word — like your business name, a staff member's name, or a menu item — you can add a custom pronunciation rule.

  1. Go to Agent → Voice & Languages
  2. Scroll to the Pronunciation section
  3. Click Add Pronunciation
  4. Enter the word and how it should be pronounced
  5. Click Generate to let AI suggest the phonetic spelling, or type it manually
  6. Click Preview to hear how the agent will say it
  7. Save your changes For example, if your business is called "Pho Minh" and the AI says it wrong, add a rule:
  • Word: Pho Minh
  • Pronunciation: fuh min

Personalising Your Agent's Personality

Voice is just one part of how your agent sounds. The personality settings at Agent → Personality control what your agent says and how it says it:

  • Agent Name — The name used in greetings (e.g. "Hi, I'm Sofia")
  • Personality Traits — Select up to 3: Friendly, Professional, Helpful, Casual, Formal, Enthusiastic, Calm, Empathetic
  • Tone of Voice — Warm, Professional, Conversational, or Direct
  • Response Style — Concise (short answers), Balanced, or Detailed (thorough answers)
  • Creativity (Temperature) — Controls how varied the agent's responses are. Lower values give more consistent answers; higher values make responses more natural and varied
  • Custom Instructions — Add specific behaviour rules (e.g. "Always greet with our tagline" or "Suggest popular items to first-time callers")

Publishing Your Changes

After making changes to voice or personality settings:

  1. Click Save Changes to save as a draft
  2. Click Save & Publish to push changes live Your agent will use the new settings on its next call.

Common Questions

Can I change the voice later?

Yes. You can switch voices at any time from the Voice & Languages page.

Will changing the voice affect my greetings?

No. Your greeting text stays the same — only the voice reading them changes.

Can different locations have different voices?

Yes. Each location has its own independent voice and personality settings.

How do I know which voice sounds best?

Use the Preview button to listen to samples, then make a test call after selecting one.

  • How Speako's AI Agents Work
  • Choosing Personality Traits
  • Configuring Tone of Voice
  • Adding Phonetic Spellings