Panasonic TH-43DS630U E-Manual page 26

Dual Audio
Selects stereo / monaural (if available).
Not valid in Analogue TV
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Subtitle Language
Selects between alternative subtitle languages or types (if available).
This setting is not memorised and it returns to the default setting once you
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exit the current programme.
Not valid in Analogue TV
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New Zealand only
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MPX
Selects multiplex sound mode (if available).
Watching > For best audio > Advanced Settings
For Analogue TV
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Volume Correction
Adjusts the volume of each individual channel or input mode.
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