Apparatus and methods are provided relating to delivering audio content for an interactive electronic book system, including a book with a plurality of pages with overlaying magnets affixed thereto, a magnetic sensor, a temperature sensor, a speaker, a computer with calibration and temperature compensation data stored in non-volatile memory, and audio content related to the pages of the book, such that the computer determines which page the book is open to and causes the speaker to deliver audio content related to the open page. Apparatus and methods are provided for calibrating an electronic book system including temperature compensation steps.