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There are a lot of screen recording software, for example: CamStudio (free) Screenpresso (free/paid versions) Movavi Screen Capture Studio ($49.95) Camtasia Studio ($299.00)
You can make your own. Take any single professionally recorded audio source you can find and mess with the EQ at random. This will be your "bad" and the actual recording will be your "good". EQing is really something you are best to learn by feel. Get some good audio tracks that are just an instrument or just a vocal or just speaking. If they are well ...
Wikipedia is not a bad resource for explaining the different types of edits in continuity editing. Some have examples using stills of the out and in points, or references to usage of the edit in a well known film sequence. http://en.wikipedia.org/wiki/Continuity_editing http://en.wikipedia.org/wiki/180-degree_rule ...
He uses Camtasia Pro ($200) a Wacom tablet and (at least on the earliest videos) MS Paint. And a head mic. http://www.teachthought.com/technology/how-to-screencast-like-the-khan-academy/ On a mac, a similar piece of screen capture software would be Screenflow, although Khan works on a Windows machine: http://www.telestream.net/screenflow/
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