Can someone please explain how this function? It is for simultaneously recording with the input(X) being white noise at FS 44100hz

function recording = audioOI(x,fs)

% audioOI - Simulataneously plays and records the test signal.

% Uses Parallel Computing Toolbox.

% INPUT: x - test signal

% fs - sampling frequency

% OUTPUT: y - recorded signal

time = length(x)/fs; % play/record time

recObj = audiorecorder(44100,16,2);

parfor ii = 1:2

if ii==1

recordblocking(recObj, time);

recording{ii} = getaudiodata(recObj);

elseif ii==2

soundsc(x, fs);

end

end