OpenAL http://www.openal.org/
1. Download OpenAL 1.1 SDK & Installer for Windows and install them
- Download http://connect.creativelabs.com/openal/Downloads/OpenAL11CoreSDK.zip
 - unzip the file
 - run OpenAL11CoreSDK.exe
 
- Download http://connect.creativelabs.com/openal/Downloads/oalinst.zip
 - unzip the file
 - run oalinst.exe
 
2. Set environment variables
- Go to Control panel -> System icon -> Advanced tab -> Environment variables
 - Create a new variable called “OAL_ROOT” and set the value “C:\Program Files\OpenAL 1.1 SDK” for Visual Studio .Net 2010
 
3. In Visual Studio .Net 2010
- Configuration Properties -> C/C++ -> General -> Additional Include Directories “$(OAL_ROOT)\include” 추가
 - Configuration Properties -> Linker -> General -> Additional Library Directories “$(OAL_ROOT)\libs\Win32” 추가
 - Configuration Properties -> Linker -> Input -> Additional Dependencies “OpenAL32.lib” 추가