I think that such questions are too localized. What is the benefit of future readers that find those questions?

The other issue I can find with that kind of questions is that Stack Exchange sites don't allow to attach files to questions, if they are not images. What would happen if the voice recording is hosted in a site that would have any problems, or that lost the file you stored there? Future readers would find a question they would not be able to understand. Questions that are asked are not just helpful for who ask them, but also for the future readers; if a question is only helpful to who asks it, then the question is too localized.

Then, how do you decide which word to pronounce when you record your voice? If you record your voice when you say a simple word (e.g. _for_, _example_, _why_) who is native English speaker could not find anything wrong with your pronunciation. Do you ask about a word that you think you are not correctly pronouncing? How useful is the question if the answer would be "You correctly pronounce it"?