Play a tone periodically and output an analog sync signal in Matlab

tone_sync.m

% params
interval = 10;
f = 2800;
fs = 8192;
dur = 2;

% Generate waveforms
t = 0:1/fs:dur;
tone = sin(2 * pi * f * t);

% Set up the analog output
s = daq.createSession('ni');
daq.getDevices();
device = devices(1);
ch = s.addAnalogOutputChannel(device.ID, 0, 'Voltage');
s.Rate = 100;

% Start outputting
while true
    s.outputSingleScan([5]);
    sound(tone, fs);
    pause(dur);
    s.outputSingleScan([0]);
    pause(interval - dur);
end