LCD TV USB volume

Is it standard not to be able to adjust the volume of the USB input on a Hisense LCD / Plasma TV?

Some time ago I've discovered the joy of watching my movies in HD on aforementioned device, but the TV outputs the USB's sound far too strong, it distorts like crazy. The volume buttons on the remote don't work in USB mode, with nothing I can see in the menu to turn it down.

Whom among you have solved this issue how?
 
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