How to controll volume of loading movie ?


I’m using movie player to play loading movie:

FLoadingScreenAttributes LoadingScreenAttributes;



but, is there any way to controll how loud the audio of this movie will be played ?
(for example user set sound volume to 10% in main game menu (via USoundClass & USoundClass::Properties.Volume))
I see no way to assign USoundClass to the MoviePlayer, there is also no method to set volume directly - any other ideas ?
(I have no problems in setting volume to MediaPlayer videos as they expose sound component, etc. - this is only the loading movie that is problematic).

any news on that?