Here You can configure individual TTS voices for each actor in the game.
To use the text-to-speech feature You need to set the speech volume!
You can set the speech volume in the options menu in the main game window (below).
The available choices depend on Your platform, OS, browser and language settings.
Some browsers offer online voices, these may have terms of services and privacy policies.
The voices for the grayed-out portrait are used by un-named, generic NPC.
The actor with the '?' portrait is the default (narrator) voice, it's used to read all texts that are not spoken by any one person.