How to Add Message Voicing
1. Open Text-to-speech in the dashboard.
Chat Commands - Text-to-Speech (TTS)
Changing the Voice
Split Audio Source for OBS (Browser)
It separates TTS control from the audio output in OBS, which is handy with several audio tracks. Both links are in the Links for OBS block on the Text-to-speech page.
Available Voices for TTS
Additional information