There is no more efficient way to attend a lecture. Record lecture audio and text notes while watching the slides. When you get home you will have slides, audio, and text notes in sync so you can absorb knowledge from all three dimensions. You can even increase the playback speed when you want to get through the lecture faster. Like no other app out there, I make the magic happen. Take that OneNote!! I run on Windows desktop with aspirations to grow out of it. ;) Take me for a spin and you will be impressed.