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# Conversational voice design

## Overview

Selecting the right voice is crucial for creating an effective voice agent. The voice you choose should align with your agent's personality, tone, and purpose.

## Voice design

If you need a voice that doesn't exist in our library, [Voice Design](/docs/eleven-creative/voices/voice-design) lets you create custom voices from text descriptions. Define characteristics like age, accent, tone, and pacing to generate voices tailored to your agent's personality and use case.

## Library voices

These voices offer a range of styles and characteristics that work well for different agent types:

* `kdmDKE6EkgrWrrykO9Qt` - **Alexandra:** A super realistic, young female voice that likes to chat
* `L0Dsvb3SLTyegXwtm47J` - **Archer:** Grounded and friendly young British male with charm
* `g6xIsTj2HwM6VR4iXFCw` - **Jessica Anne Bogart:** Empathetic and expressive, great for wellness coaches
* `OYTbf65OHHFELVut7v2H` - **Hope:** Bright and uplifting, perfect for positive interactions
* `dj3G1R1ilKoFKhBnWOzG` - **Eryn:** Friendly and relatable, ideal for casual interactions
* `HDA9tsk27wYi3uq0fPcK` - **Stuart:** Professional & friendly Aussie, ideal for technical assistance
* `1SM7GgM6IMuvQlz2BwM3` - **Mark:** Relaxed and laid back, suitable for non chalant chats
* `PT4nqlKZfc06VW1BuClj` - **Angela:** Raw and relatable, great listener and down to earth
* `vBKc2FfBKJfcZNyEt1n6` - **Finn:** Tenor pitched, excellent for podcasts and light chats
* `56AoDkrOh6qfVPDXZ7Pt` - **Cassidy:** Engaging and energetic, good for entertainment contexts
* `NOpBlnGInO9m6vDvFkFC` - **Grandpa Spuds Oxley:** Distinctive character voice for unique agents

## Voice settings

![Voice settings](/docs/_fern-img/007b0ec153f9210ce48a6e6ed3184c4d004476222a2be2b5bf6ab6afdecf4804.webp)

Voice settings dramatically affect how your agent is perceived:

* **Stability:** Lower values (0.30-0.50) create more emotional, dynamic delivery but may occasionally sound unstable. Higher values (0.60-0.85) produce more consistent but potentially monotonous output.

* **Similarity:** Higher values will boost the overall clarity and consistency of the voice. Very high values may lead to sound distortions. Adjusting this value to find the right balance is recommended.

* **Speed:** Most natural conversations occur at 0.9-1.1x speed. Depending on the voice, adjust slower for complex topics or faster for routine information.

> **Tip**
>
> Test your agent with different voice settings using the same prompt to find the optimal
> combination. Small adjustments can dramatically change the perceived personality of your agent.