The title may be a bit off, as this is a book on Taoist healing sounds, which can be used to supplement Qi Gong practice. A large chunk of this book is anecdotes relating various incidents pertaining to the author, and his Qi Gong practice, while the instruction in itself is pretty simple, and doesn't take long to explain.
However, the practice is helpful, and will definitely give your regular Qi Gong routine a positive boost.