The Pet for Us Harcourt Leveled Readers. Lesson 20 by Casey McLaughlin Copyright Year: 2007 ISBN-13: 9780153584589 Available format(s): Classic Audio Log in to read What's an Audio Format Audio format refers to the way an audiobook is recorded. Not all audiobooks have the same formats. Classic Audio: A human reading an audiobook without the text displayed. VOICEtext (H): Human narrator with text that you can follow along with as it reads. VOICEtext (S): Synthetic voice with text you can follow along with as it reads.