For Audiobook Creator to convert the file in the language of the book, you need to make sure to have the same language set as the eBook. Then you will have a good audio conversion.
Additional voices can be downloaded in system settings on Mac OS X.
To download additional voices from Apple,
- Go to System Preferences -> Dictation & Speech or Speech-> Text to Speech
- System Voice -> Customize…, Then choose additional voices to download (click ‘OK’ button).
- Once the download has completed relaunch Audiobook Creator, now you can use them within the app.
- You need to go to preferences to select the newly downloaded voice to use in conversions, once launched, Audiobook Creator->Preferences