History

ObjectAL now supports Mac OSX as well as iOS
Demo app now compiles for both Mac and iOS
Reworked the action system to be more flexible when adding time curve functions
Added source notifications, which call user code when ALSource playback completes
Better multithreading support
Many bugfixes

ObjectAL supports compilation with or without ARC
Updated to compile without warning in Xcode 4.2 using CLANG
Demo app updated to use cocos2d 1.0.1
ALChannelSource now supports adding/removing sources, and splitting off and joining channels
Better queue support in ALSource
OALSimpleAudio can now be initialized with a user defined number of mono and stereo sources
Many bugfixes

BackgroundAudio has been replaced with OALAudioTrack and OALAudioTracks.
ObjectAL has been renamed to OpenALManager.
IphoneAudioSupport has been replaced with IOSAudioSession, with OpenAL loader functions moved to OpenALManager and OALAudioFile, and other utility functions moved to OALTools.
SimpleIphoneAudio has been renamed to OALSimpleAudio.
SoundSource has been renamed to ALSoundSource.
ChannelSource has been renamed to ALChannelSource.
SoundSourcePool has been renamed to ALSoundSourcePool.

OALAudioTrack: Allows more than one background audio track to play at a time.
OALAction: Allows actions to be performed on audio objects. You can configure ObjectAL to make all actions subclasses of cocos2d actions in ObjectALConfig.h
OALFunction: Allows you to modify how a duration based fade, pan, or pitch gets applied in an action.

Changed the file layout.
SoundSource objects (such as ALSource) support duration based fade, pan, and pitch.
OALAudioSupport has new properties "hardwareMuted" "hardwareVolume", "audioRoute", and "ipodDucking".
OALSimpleAudio has methods to preload multiple sound files at a time.
OALAudioTrack supports duration based fade and pan.
OALAudioTrack has notifications for start/stop playback and for when the source changes.
Audio tracks support starting playback at an arbitrary point.
OALAudioSession and other audio objects can now be suspended manually
New demo: Audio Tracks.
New demo: Hardware Monitoring.
ObjectAL can now be compiled as Objective-C++ if you want.
Fixed crash issue when the first attempt to start the audio session fails.
Workaround for compiler bug when compiling for iOS4.1 with LLVM.
Fix for SynthesizeSingleton when using a nonstandard init method.
Compiles with stricter warnings.
Audio objects now have "volume" as an alias to "gain".
Fixed bug that caused distortion when loading certain formats into OpenAL.
Much improved audio session handling for various edge cases.
Better interrupt handling.

Added realtime fading to ObjectAL and BackgroundAudio
Moved "allowIpod", "honorSilentSwitch", and "ipodPlaying" from BackgroundAudio to IphoneAudioSupport
Added new boolean switch "useHardwareIfAvailable" to IphoneAudioSupport
IphoneAudioSupport now accepts a session category override for traditional kAudioSessionProperty_AudioCategory style category setting.
Added compile-time configuration file ObjectALConfig.h
All library calls are now synchronized (can be disabled in ObjectALConfig.h)
Improved audio session handling
Compatible with CLANG-LLVM 1.5 compiler
Simulator bug workaround now disabled by default
Various bug fixes