Enable Audio Passthrough

Make sure to use the last posted firmware from here
https://bbs.stationpc.com/thread-222-1-1.html
Go to Sound Settings
passthrough1.png

Decode and Bitstream
passthrough2.png

Change to HDMI Bitstream
passthrough3.png

Change Codecs to Manual
passthrough4.png

Manually enable all the codecs
passthrough5.png

In Kodi

audio1.png

Change the Audio Output device to 'AudioTrack (IEC) Kodi IEC packer (recommended)'
audio2.png

Enable 'Allow Passthrough' and change 'Passthrough Output device' to 'AudioTrack (IEC) Kodi IEC packer (recommended)'
Now enable all the codecs your AVR supports
audio3.png