There is dual audio version of libreelec to wetek play, core, x86/64,imx6, rpi:
Index of /LibreELEC-DualAudio
and a kodi forum:
[Project] Dual Audio Output support (Krypton/Jarvis/Isengard/Helix/Gotham/Frodo)
[PATCH] Dual Audio Output support for XBMC (Eden Updated)
Possible it build to S905?
Can it implement to main version, or can someone make it?
I never compile, so when no one make it, after little help I can make too.