SILVIA uses Native System voice fonts by default. For Windows Users, you can find supported Native TTS Languages at the Microsoft Website, and instructions on how to add more to your System. For MacOS users, you can find support Native TTS Languages on the Apple Website, with instructions on how to add more to your System.
The SILVIA API has commands for obtaining the Text and Voice outputs, which can be sent to any Text-To-Speech of your choice to generate speech audio.
The SILVIA Core runtime can be delegated via script to send Voice Out text to a Text-To-Speech Library if one is available. Voice fonts can be switched by running a boot script in the SILVIA Brain File. For Example: