NotebookLM's audio mode doesn't just read out the given text, it creates a podcast format with 2 hosts where one will ask questions and the other will answer, and go back and forth in a discussion style.
Using an "AI" (LLM) enhanced TTS adds in tone and other markers to let the underlying TTS sound much more natural. You can then double down with an ML tuned TTS to get a more natural voice.
squeaky-clean|8 months ago
vorpalhex|8 months ago
guerrilla|8 months ago