cec-client use to mute tv speakers (hack)

Hi,

I am trying to send cec-client command out from kodi to my tv.

the command is 'Set System Audio Mode' to ON. This should mute my tv speakers. So that only pass through is active I hope.

I found cec specs @ CEC_Specs.pdf.
Look at page 42.

I found cec generator CEC-O-MATIC

and more info here.

Raspberry Pi • View topic - Scripts for controlling HDMI devices from the RasPi

The end result would be to add a command in the Autostart.sh every time kodi boots what do you guys think can this work?

Thanks