Soundprinting is a technology that allows for sound to be embedded into the pages of a book.
The printing process creates a code that is invisible, but which can be read by a sound reader.
The sound reader reads the code and then plays a sound file that is linked to that code.
A book can have many codes, and many sound files. These are all stored on a micro SD card inside the reader.
The files are formatted as an AP4 file bundle. The AP4 file bundle can contain the files for many books.
This means that your sound reader can play many books, as long as you have the right files on the card inside the pen.
Batchelor Press has published 4 books using sound printing.
If you have a sound reader, you can download the Batchelor Press AP4 bundle from this link.