HDMI CEC - Forward volume keys - Sony Bravia

hi all

just got the new H9S and happy with it so far apart from the issues already discussed on the forum.

one thing i cannot get to work is HDMI CEC to forward volume keys via zgemma remote to my Sony Bravia. Has anyone else had this issue and knows of a workaround? possibly a bravia thing and something i need to configure but have not been able to fix it yet.

used to work fine with my H2S box.