Does Coreelec support 5.1 audio on a 905X box? Can you add a USB sound card to get the extra ports for the other channels, or any other options known to work?
It supports 5.1, at least through HDMI. I don’t know about external USB sound cards. I guess it will depend whether there’s a driver for it in the kernel or not.
Is there a list of usb audio drivers somewhere?