Some (more) questions about OpenAL and Gizmo: In the Gizmo folder there is an OpenAL32.dll. Why is the OpenAL32.dll of X-Plane not used? It looks like OpenAl32.dll of X-Plane is more recent. It looks like the functions sound.getcontrol() and sound.releasecontrol() are not needed anymore. Is this true? What is the difference between sound.load() and sound.loadEx() It looks like that not only the Gizmo sound functions are limited, but the OpenAL API in Gizmo is very limited too: It looks like that only the Listener and Source functions of OpenAL are implemented in the OpenAL API. The functions of Buffers, Errors, Context are not implemented. Also some functions of Source are not implemented: GenSources, DeleteSources, IsSource). What LUA binding is used for the OpenAL API?