Setting the control panel
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Press the <HOME> button to display the HOME screen.
From [SYSTEM] → [AUDIO], select [AUDIO IN].
Select [INPUT3] in [CH1 IN], and [INPUT4] in [CH2 IN].
To record the stereo microphone audio input of the <INPUT 3>/<INPUT 4> terminal to audio channels 3/4, switch to [CH3/4] in [MONITOR SEL], and then select [INPUT3] in [CH3 IN], and [INPUT4] in [CH4 IN].