I think you could enhance a lot of sites with voice overs for official articles. Maybe some blogs would also find it interesting. They need not be so complicated. Just someone who reads the article. Clicking on a voice recording would be beneficial especially on mobiles with small screens. With so much to read on the Internet sometimes hearing the text is welcome. It would nice then if adding an audio sample is as simple as adding an image.
A few tips using Audacity.
To remove high pitch noise use the “low pass filter”. Look at “plot spectrum” to see if you got the desired effect. Then apply the “noise reduction” process.