The author command is used to set the author meta field when converting a book to mp3.
Note: the command line utility ebook2cw by Fabian Kurz is required to convert books to mp3 format
require 'cw'
cw do
use_ebook2cw
book_name 'Jekyll_and_Hyde.txt'
author 'Robert Louis Stevenson'
book_dir './books'
audio_filename 'book.mp3'
audio_dir './audio'
wpm 18
convert_book
end