Some of your students learn best by reading. Others need to hear it. I've worked with course creators who spend weeks recording audio versions of their lessons to accommodate different learning preferences — and it's worth doing, but it's a significant time investment. Google's NotebookLM can generate a conversational audio recap of your lesson content in minutes. It's not a replacement for your voice, but it's a free supplementary resource that costs you almost nothing to create.
What you’ll walk away with:
- Audio summaries of lessons students can listen to anywhere
- A new content format extending your course into commute time
- Supplementary material reinforcing concepts without screen time
What NotebookLM actually does
NotebookLM is Google's AI research tool. You upload sources — documents, web pages, transcripts — and it lets you ask questions, get summaries, and generate what Google calls "Audio Overviews." The Audio Overview feature takes your source material and creates a conversational audio summary in a two-host podcast format. Two AI-generated voices discuss your content, summarizing the key points, asking each other clarifying questions, and highlighting the most important ideas.
It sounds surprisingly natural. Not perfect — you can tell it's AI-generated — but natural enough that students can listen comfortably. Google added an "Interactive Mode" in late 2025 where students can essentially raise their hand during the audio to ask questions and get real-time responses based on your source material.
For course creators, this means you can offer students an audio version of each lesson without recording anything yourself. The audio won't capture your personal teaching style or the nuance you bring to live delivery, but it will cover the core concepts in an accessible format.
How to create audio summaries for your course
Prepare your source material
NotebookLM works best with clear, well-structured text. If your lessons are primarily video, use a transcript (Descript, Otter.ai, or YouTube's auto-generated captions). If they're text-based, copy the lesson content directly. You can also upload slide decks as PDFs.
One important tip: NotebookLM summarizes everything you give it. If you upload an entire 10-lesson module, you'll get a high-level overview that glosses over details. For more focused audio summaries, upload one lesson at a time. Better to have five 8-minute targeted recaps than one 20-minute overview that tries to cover everything.
Generate the Audio Overview
In your NotebookLM notebook, click on the Audio Overview option. You can optionally give it guidance on what to focus on — "emphasize the three practical techniques," "spend more time on the case study," "assume the audience are health coaches, not academics." This steering helps the output match your students' needs. Generation takes a few minutes depending on the length of your source material.
Review and distribute
Listen to the generated audio before sharing it with students. Check that it accurately represents your content — AI can occasionally misinterpret nuance or emphasize the wrong points. If something's off, adjust your source text (add emphasis, restructure, remove tangential sections) and regenerate.
Download the audio as an MP3 and upload it to your course platform as a supplementary resource. On Ruzuku, you can add it as an attachment within the relevant lesson. Label it clearly: "Audio Recap: [Lesson Name]" — so students know it's a review resource, not the primary lesson content.
Prompts to try
Focused lesson recap
When adding source material to NotebookLM, include a note at the top: "This is a lesson for [audience] about [topic]. Focus the audio overview on the 3-4 most important practical takeaways. Assume listeners have already read the lesson and want a review, not an introduction. Keep the tone encouraging and accessible."
Pre-lesson preview
Add a guidance note: "Create an audio overview that works as a preview — something students can listen to before they do the full lesson. Hit the key concepts and explain why each one matters, but don't go deep. The goal is to prime their thinking so they get more out of the full lesson when they read it."
Module wrap-up summary
Upload all lessons from a module together with the note: "These are the lessons from Module [X] of a course on [topic] for [audience]. Create an audio overview that ties the lessons together — what's the through-line, what are the key skills or concepts students should walk away with, and how does this module connect to what comes next. Think of it as an end-of-module review conversation."
The human layer
I want to be straightforward about what this is and isn't. NotebookLM's Audio Overviews are impressive for a free tool, but they don't replace your voice as an instructor. Your students enrolled in your course because of your expertise, your perspective, your way of explaining things. An AI-generated audio summary covers the information, but it doesn't carry your authority or your personality.
That said, it fills a real gap. Many of our course creators teach students who are juggling professional responsibilities, family obligations, and continuing education. Being able to listen to a lesson recap during a commute or a walk makes the material more accessible without requiring you to record anything new.
The Interactive Mode — where students can ask questions during the audio — is useful for review. A student who's preparing for an assessment or trying to apply a concept can pause the recap and ask "Can you explain the difference between X and Y in simpler terms?" and get an answer grounded in your source material. It's not as good as asking you directly, but it's available at 11 PM on a Sunday, which you probably aren't.
My recommendation: offer audio summaries as a supplementary resource, clearly labeled. Don't present them as a substitute for the actual lesson. Students who engage with both the primary content and the audio recap are doing a form of spaced retrieval practice — encountering the same concepts in a different format — which the research consistently shows improves retention.
What it gets wrong
- Can flatten nuance. The two-host format is designed to be conversational and accessible, which sometimes means oversimplifying concepts that require careful treatment. If your lesson deals with something sensitive or technically precise, listen carefully before sharing.
- The "podcast" format isn't for everyone. Some students find the two-host conversational style engaging. Others find it annoying — they'd prefer a straightforward narration. You can't change the format; it's how NotebookLM generates Audio Overviews. Be upfront that it's a conversational-style summary.
- No editing after generation. You can't edit the audio output directly. If a section is inaccurate or poorly emphasized, your options are to adjust the source material and regenerate, or to accept the imperfection. For most supplementary review purposes, minor imperfections are fine.
- Not a custom GPT replacement. Custom GPTs can answer open-ended questions from your course content, but they can't be embedded outside ChatGPT, have a roughly 10-message-per-5-hour limit on the free tier, and don't provide analytics. NotebookLM's Interactive Mode is more accessible for most students, but it's limited to the audio context — it can't search your full course library.
Related guides
- Recording Course Lessons with Loom — when you want your own voice, not AI's
- Creating End-of-Module Review Activities with AI — text-based review to complement audio recaps
- Recording Async Video Feedback with Loom — personal video messages alongside AI-generated audio
- Generating Discussion Prompts with AI — turn audio recap insights into discussion topics
Give your students another way to learn
Not every student learns the same way, and not every student has time to sit down and read through a full lesson. Audio summaries meet students where they are — on the go, reviewing before a session, or reinforcing concepts after the lesson. Start free on Ruzuku and build courses that support every kind of learner.