The main thread of the dual audio support for Kodi is here:
http://forum.kodi.tv/showthread.php?tid=192480
OpenELEC_dualaudio github repository:
https://github.com/xhbl/OpenELEC_dualaudio
Download:
7.0.1: OpenELEC-Generic.x86_64-7.0.1-DualAudio-r015.tar
6.0.3: OpenELEC-Generic.x86_64-6.0.3-DualAudio-r020.tar
5.0.8: OpenELEC-Generic.x86_64-5.0.8-DualAudio-r017.tar
4.2.1: OpenELEC-Generic.x86_64-4.2.1-DualAudio-r019.tar
http://forum.kodi.tv/showthread.php?tid=192480
OpenELEC_dualaudio github repository:
https://github.com/xhbl/OpenELEC_dualaudio
Download:
7.0.1: OpenELEC-Generic.x86_64-7.0.1-DualAudio-r015.tar
6.0.3: OpenELEC-Generic.x86_64-6.0.3-DualAudio-r020.tar
5.0.8: OpenELEC-Generic.x86_64-5.0.8-DualAudio-r017.tar
4.2.1: OpenELEC-Generic.x86_64-4.2.1-DualAudio-r019.tar