Acer AT1919DF User Manual page 27

MPX
If you are viewing an analog channel that supports multiple sound signals (e.g. NICAM,
Bilingual), you may set which signal is used.
Preferred audio language
If multiple audio streams are available, the TV will attempt to use the language set here.
The current setting is displayed in the Information screen (press the DISPLAY key).
Preferred subtitle language
If multiple subtitles are available, the TV will display the language selected in this option,
if it is available.
When watching TV, press the SUBTITLE key to see a list of available subtitles.
CI information
This setting shows information about the CI interface, if a CI card is being used.
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