Boss Audio Systems BVI9994 User Manual page 26

24.2 LANGUAGE SETUP
OSD LANGUAGE
This item is for selecting the language of the SYSTEM MENU and all operating
prompt interface displayed during playback.
AUDIO LANG
This item is for selecting a audio language.
SUBTITLE LANG
This item is for selecting a subtitle language.
MENU LANG
This item is for selecting a disc menu language.
24.3 AUDIO SETUP
KEY
It is for selecting your desired basic music tone(from low to high).
24.4 VIDEO SETUP
BRIGHTNESS
It is for adjusting the brightness of the video output.
CONTRAST
It is for adjusting the contrast of the video output.
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