Sony RMT-840 - Manual (Page 57)

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Using the Menu 57
WIND
MIC/LINE IN
G ON Standard setting.
OFF Select when you want to record the sound as it is without reducing the
noise caused by wind.
G EXT MIC Select to input an audio signal when a microphone is connected to the
MIC/LINE jack.
LINE Select to input an audio signal when an audio device is connected to
the MIC/LINE jack.