Most formula-to-speech software only works with MathML, so you would first need to convert the LaTeX you find on arXiv.
There may be an alternative, under development for AWS:
Tex2Speech takes LaTeX documents and converts them into spoken audio.
Here is the documentation, and this is how it sounds when confronted with a simple equation.
It looks promising, but I read that you need an account with AWS, which may well complicate things.
