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Open Brain → Conversation Style. Use Voice style for calls and Chat style for texts. The Chat style tab appears when Chat is enabled.

Voice style

Describe how you want the agent to sound. Keep this about delivery rather than business facts or the questions it must ask. For example: “Use a calm, conversational pace. Keep replies short and let the caller finish before responding.” Choose the speaking voice from the voice picker and listen to its sample. Use the available filters to narrow the choices, then test the saved voice in a conversation. A sample demonstrates the voice, not how it handles your leads.
Use these descriptions to shortlist a voice, then listen to its sample in the picker.

Language

Every voice can speak every language the voice model supports, whatever its accent: Afrikaans, Arabic, Armenian, Azerbaijani, Belarusian, Bosnian, Bulgarian, Catalan, Chinese, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, Galician, German, Greek, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Italian, Japanese, Kannada, Kazakh, Korean, Latvian, Lithuanian, Macedonian, Malay, Marathi, Maori, Nepali, Norwegian, Persian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swahili, Swedish, Tagalog, Tamil, Thai, Turkish, Ukrainian, Urdu, Vietnamese and Welsh. A dialect is spoken as its language. A voice marked with a language, such as Portuguese or German, sounds native in it; the others speak it in their own accent. The language goes in Voice style. A rep built with Tars speaks the language you spoke with Tars, unless you asked for another one, and it follows a caller who speaks a different language. Try it in a roleplay to hear how it sounds.

Chat style

Describe how the messages should read. You can set a preference for length, formality, punctuation or formatting. For example: “Use short, friendly texts. Avoid em dashes and unnecessary greetings.” Keep the business information in Instructions. Chat style changes presentation; it does not decide which services you offer or which actions the agent may take. It also does not rewrite a fixed message entered in a workflow’s Send SMS step.

Background sound

Choose a background and adjust its volume, or leave it off. Keep it quiet enough that the caller can understand the agent easily.

Orb colour

Click the agent’s orb to choose its appearance. Pick Default, Curated, a named colour pair or Custom, then save. Custom uses two colours: the orb and its glow. This only changes its appearance, not its voice or behaviour.

Review your change

Wait for saving and setup to finish, then test a call or message. Try the same question before and after the change. If the answer itself is wrong, edit Instructions or the relevant workflow instead of changing the style.