Have you read these wiki entries?
In your setup you can not use HDMI directly to the AVR (actually why not?) you would disable sound on HDMI and configure passthrough for the SPDIF supported codecs.
Notice: There’s a new audio wiki article now. See here: Audio hardware and software configuration
This one is now deprecated and will be locked.
This wiki entry should give you an overview over recommended audio settings in different scenarios of using your OSMC device… Other than that there’s some explanation of the different audio settings available as well as some related audio information (FAQ).
Recommended audio settings when using your AVR/soundbar/TV’s HDMI input
Go to Settings/Sy…
Notice: There’s a new audio wiki article now. See here: Audio hardware and software configuration
This one is now deprecated and will be locked.
OSMC supports a range of devices: All Raspberry Pis and our own Vero series.
Veros have an HDMI port for video and audio, a CVBS port for composite video and analogue audio (not Vero1) and an S/PDIF port (TOSlink or coaxial).
Raspberry Pi has an HDMI port and a CVBS port . Third-party HATs are available to provide better quality analogue and S/P…