My worst typos seem to show themselves when I am listening to one of my novels during the audio stage of editing. That's when I find out I've left out some little word like "the" or "to" or something like that. Why I don't notice those when I'm doing a visual edit is beyond me, but I sure do hear it when I'm listening.
How do you set up the audio stage of editing?
A fellow author sends me their final draft as a .mobi and I listen to that on my Kindle Fire to spot errors.
An audio stage of editing is a very good idea.
How many authors do this?
I've used two methods.
Method one - requiring no special equipment, I simply read the words out loud myself - it's amazing how many really odd sentences I pick up that way! And missing words and switched around words also crop up - I'm really bad for mixing up "little" words - to, of, is, if, and so on.
Method two - I've got an app called "@Voice Aloud Reader" on my Android phone - I emailed a copy of my WIP to myself, downloaded it onto my phone and had the app read it to me. The app takes a whole bunch of different formats, including e-books. Also, I'm sure lots of other apps are available, this just happened to be the highest rated free one when I was looking.
I'm not sure I got as many weird stuff ironed out on the app - I found it a lot harder to concentrate with the phone reading to me, which I suspect is more to do with my attention span than anything else!
Reading aloud / having the book read aloud takes a lot of time - I can only really do one chapter at a time, and need a longish break in between. My chapters tend to run between 3k and 6k, depending on what's going on at that point in the story.
On balance, I think I prefer reading it myself as I pay more attention. I've also found it an invaluable part of my final editing, and plan to keep going with it.