I had installed a testing release a while back (v18 kodi) dealing with some issues then. Just forgot to switch repos back.
Just in case: there doesn’t seem to be any audio sync problem with the stable releases. In fact playback is great - even including x265/UHD.
Just noticed: it seems I have v18 kodi installed, not v19. I got the .img file from Download - OSMC - for the Vero4K+. Did a fresh install of osmc with that image.
Did another fresh install. Running Kodi v18.9.
This topic should end here. This would now be an install issue, not testing.
thx.
ken