Yes, you can use the same avatar to speak in multiple languages within a single scene — but there are a few important limitations and steps to follow.
Things to Keep in Mind
Not all voices are available in all languages or dialects.
For example, a voice like Ada/Helena – Cheerful may be available in Spanish (Mexico) but not in Spanish (Spain) or Spanish (United States).You can’t switch voices mid-sentence.
Language changes must happen between lines of text.
How to Add Multiple Languages in One Scene
Start a new line for each language
Press Return/Enter to create a new line.
Paste or type the text in the second language.
Check if the voice updates automatically
Synthesia will often auto-detect the language and switch to the appropriate voice if available.
If the voice doesn’t update automatically:
Click on the speaker pill for the line that didn’t update.
On the right side of the speaker pill, click the voice selection dropdown.
At the top, click Back to all languages.
Search for the language of your text.
Select a voice that matches the language.
If the same voice isn’t available in that dialect, try another dialect.