Google is upgrading its AI-powered note-taking and research assistant, NotebookLM, with a new feature that allows users to customize the tone of its Audio Overviews AI-generated podcasts that summarize and discuss documents, such as course readings, legal briefs, or research papers.

Four New Formats

Users can now choose how they want their AI podcasts delivered.

• Deep Dive: A conversational dialogue where two AI hosts explore topics in-depth with thought-provoking questions and analysis.

• Brief: A short, snappy summary that captures core ideas quickly.

• Critique: A review of sources with constructive feedback for improvement.

• Debate: Two AI hosts presenting opposing perspectives for a balanced discussion.

These options also allow customization of podcast length, tailoring content to different needs.

New Voices for AI Podcasts

Along with tone control, Google is adding new voice options to Audio Overviews, a highly requested update from users.

Expanding NotebookLM’s Capabilities

The upgrade follows Google’s steady push to make NotebookLM more versatile. Recently, the platform introduced Video Overviews, which transform dense content, such as raw notes, PDFs, and images, into visual presentations. NotebookLM also launched featured notebooks curated by authors, researchers, and nonprofits, and rolled out standalone apps for Android and iOS.