Depends on the book and how it’s produced. I loved Guernsey Literary and Potato Peel Pie Society, which is epistolary and each character was a different actor who read their own letters. The Historian, on the other hand, was an overproduced mess where if a character was reading a letter that recounted a conversation between two other people, you’d get all four voices-the recipient, the letter writer, and the two people overheard.

I hate sound effects but will admit to not minding the jazz bumpers in The Rivers of London.