I edited the audio of a few math videos to upload to YouTube and I had to fix "typos" like "then one plus zero is zero". The problem is that there are no spaces in the voice, so it sounds like "thenonepluszeroiszero."

So I had to look for a "one" that is in a similar context, after an "s" and before a ".", or at least a similar one. And hope the speed matches, and adjust the volume.

They were free videos, so it was not necesary to get it perfect, but at least reduce the distraction caused by mistakes.