New Tone Options for Audio Overviews

Google’s NotebookLM now lets users customize the tone of its AI‑generated Audio Overviews, which function as podcasts that summarize and discuss documents uploaded to the platform. Four distinct formats are available:

• Deep Dive: Two AI hosts engage in a conversational dialogue that unpacks the topic with depth and questions.
• Brief: A concise, bite‑sized overview designed to help users quickly grasp core ideas.
• Critique: An evaluative format that reviews sources and offers constructive feedback for improvement.
• Debate: Two AI hosts present differing perspectives on the material, creating a balanced discussion.

Each format lets users control the length of the podcast, ensuring the output matches their preferred depth and time commitment.

Additional Voice Customizations

Alongside tone selection, Google has introduced new synthetic voices for the AI podcasts, addressing a long‑standing request from users seeking more variety in how the content is delivered.

Recent Enhancements to NotebookLM

These tone and voice upgrades build on a series of recent enhancements. A few weeks prior, Google launched Video Overviews, allowing dense multimedia—such as raw notes, PDFs, and images—to be transformed into digestible visual presentations. The platform also received a curated collection of featured notebooks from authors, publications, researchers, and nonprofits, broadening the range of topics users can explore.

In May, Google released standalone NotebookLM apps for Android and iOS, extending the tool’s reach to mobile users. All of these features, including the new Audio Overview customization, are being made available in every supported language and will be accessible to all users this week.

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