You can select the external input to be recorded that is connected to the
(microphone) jack.
tab - “Select Input,” and then press
.

or
to select “MIC IN” or “Audio IN,” and then press
.
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.