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I am with you. Apple with the iPad has a fairly strong hold on certain markets like education but I will never personally own a iPad. They are nowhere close to being flexible enough to meet my needs.
I have found an Android app that records the visual aspect but doesn't handle the audio. I am exploring avenues to increase interest in an app that will do that and more so hopefully there will be something similar soon.
I would also like to see one that would allow overlaying an image into the presentation. As an example, Powerpoints can be saved as image files, as well as other possible options, allowing a base starting point of math problems for example to then work through without having to write the original problem. Once you visualize the options this could present, you will understand the basic need for this type of option.
You can look at Paint Joy. It is the closest I have found allowing your canvas to be turned into a video but no audio recorded at the time.