You can select the external input to be recorded that is connected to the
(microphone) jack.
PLAY/STOP・ENTER.

or
+ to select “MIC IN” or “Audio IN,” and then press
PLAY/STOP・ENTER.
(stop) to exit the menu mode. You can select one of the menu items available.
MIC IN:
Select when you record files using an external microphone.
(Initial setting)
Audio IN:
Select when you record using other equipment.