Youtube Tv sound volume issue

Hello everybody

i have a zgemma H11 with BlackHole 5.1 as its main image
i enabled Youtube Tv from OpenBh Apps (OpenBh Speed Up) and now i can access to Youtube Tv from menu.

it works well: i can search, play videos but i'm facing a major issue:
- i cant change "Youtube Tv" sound volume with remote control keys.... i tried all keys but nothing works ....

Hope you'll be able to help me, or resolve this issue if related to BlackHole

Thank you
 
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