I am running LibreELEC on a Raspberry 3b and I am quite impressed so far. Almost everything works - and I have spend quite some hours tinkering. But one thing is really annoying - when we playback recorded tv programs the volume control does not work. We mostly use a remote keyboard - and pressing volume up or down the volume dial shows up on the screen but does not change. When using volume up/down Android Kore (latest version from FDroid) nothing happens.
Volume control and all other controls works as expected everywhere else, just not the volume up/down during Recording playback!
Setup:
Rasberry 3b
NFS mounted media storage
output using hdmi trough Amplifier which splits out audio before sending video on to old tv screen
Default LibreELEC skin
TVHomRun from cable using TVheadend in LibreELEC