Minor changes.

Updated for iOS 3.2 by describing changes in the behavior of movie player audio sessions. See “Working with Movies and iPod Music.”

Minor changes to description for “Optimizing for Minimal Power Consumption” and “Specifying Preferred Audio Hardware Settings.”

Improved “About Configuring Audio Behavior.”

Added code recipe: “Checking if Other Audio is Playing During App Launch.”

Added code recipe: “Configuring Audio Units to Continue Playing When the Screen Locks.”

Added best practice information for working with audio hardware, as follows: added “Important” note to “Specifying Preferred Audio Hardware Settings”; added “Important” note to “Querying Hardware Characteristics”; improved the code recipes in “Querying and Using Audio Hardware Characteristics.”

Provided additional information on Simulator behavior in regard to audio sessions in “Developing with the Audio Session APIs.”

Added some tips for working with the characteristics of the Simulator in “Running Your App in the Simulator.”

Updated for iOS 3.1 to include descriptions of new audio session properties.

Expanded document by adding four new chapters: “Handling Audio Interruptions,” “Handling Audio Hardware Route Changes,” “Optimizing for Device Hardware,” and “Working with Movies and iPod Music.”

Added new material to “Configuring the Audio Session” including “How Categories Affect Encoding and Decoding” and “Fine-Tuning the Category.”

Added new sections in “Audio Session Basics”: “What Is an Audio Session Category?” and “The Two Audio Session APIs.”

Expanded “Audio Session Cookbook” to include examples to support new material.

New document for iOS 2.2 that explains how to use an iOS application’s audio session.