Google's NotebookLM can discuss your notes with you now. How to access it (and why you should)
You can visit the NotebookLM website or Google Labs and click 'Try NotebookLM' to get started. You'll need a Google account to sign in, but the experience is free. Then, to create an Audio Overview, open an existing notebook, click on the Notebook guide, and then 'Generate' to create the Audio Overview.