I think that such questions are too localized. What is the benefit for 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 problem, or lose 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 those who ask them, but also for future readers; if a question is only helpful for the person 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_), those who are native English speakers may not find anything wrong with your pronunciation. Would you ask about a single word that you think you are not pronouncing correctly? How useful will the question beif the answer is "You pronounce it correctly"?