Turn your favourite book or document into a podcast with narration, voices, and effects using Google NotebookLM. Here’s how it works.

By leveraging the power of Googles NotebookLM app, you can transform any book into a rich, immersive podcast experience.

I am looking for free (no cost, and if open source then that's better) software that allows me to import an mp3. I've heard that dragon is a leader for non-free, but am wondering what is available ...