Tushar Mehta / Android Authority
TL;DR Google is testing a new lectures Audio Overview style in NotebookLM that can turn notes into a single-host, 30-minute explanation.
The Lecture format would sit alongside existing modes, such as Deep Dive, Brief, Critique, and Debate.
NotebookLM is also teasing British English narration voices planned for 2026, with an early easter egg already live in a Featured Notebook.
As much as we admire NotebookLM, Google isn’t resting on its laurels and continues to tweak the AI app. The latest feature in testing looks to be a new “Lecture” format for Audio Overviews in NotebookLM, and there may also be a British twist on the way.
Instead of two AI hosts chatting things through, Lecture appears to stick to a single narrator delivering a continuous, lecture-style explanation that can run for up to half an hour. According to TestingCatalog, which appears to have enabled the feature in a teardown of the app, the Lecture option shows up alongside existing Audio Overview formats, such as Deep Dive, Brief, Critique, and Debate.
Have you used NotebookLM's Audio Overview feature? If yes, what do you think about it? 395 votes It's great! I use it very often. 57 % I like it but it could use more features. 22 % I've yet to find it useful. 8 % I don't use it all. 7 % I haven't heard of Audio Overview. 5 % Something else (comment below) 2 %
The key difference between these lectures and other versions of NotebookLM Audio Overviews lies in tone and structure. This one’s designed to calmly explain and connect ideas across your sources, rather than summarising quickly or staging a back-and-forth. Paired with the “Long” length setting, it looks built for proper sit-down listening, or at least something you can stick on during your commute to get to grips with a subject.
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