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Set these on the editor’s Avatar & voice tab.

Avatar

Pick any avatar from the library. Each one suggests a voice: when you change the avatar, the voice changes to the new avatar’s suggestion, unless you picked a voice yourself. Try them live opens the Avatars page, where you can talk to each avatar for two minutes for free. See every avatar, with its ID and suggested voice, on Avatars.

Custom avatar

Once we’ve built your custom avatar, enter its avatar ID (for example acme-presenter) in the Custom avatar field. IDs use letters, numbers, - and _, up to 64 characters.

Voices

Voices come in two groups. Click a voice’s play button to hear a sample, then click the voice to pick it. View all lists every voice in a group.
For callers who may speak other languages, pick a Multilingual voice and keep Reply in the language they speak in your prompt.

Speaking speed

Drag Speaking speed from 0.50× to 1.50×. The default is 1.00×. Some voices have a narrower range and use the closest speed they support.