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How to change a parameter while the signal is running?

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Hello everyone,
I want to generate a signal that can be changed while running. I want to be able to change the magnitude while the signal is running. I tried generating a signal in background and i wrote different values for the magnitude in the command box but it didn't change anything.
I have the following code:-
%-------------------------------------
clearvars
clc
d = daqlist("ni");
deviceInfo = d{1, "DeviceInfo"};
dq = daq("ni");
fidData = fopen("logData.bin","w");
fidTime = fopen("logTime.bin","w");
DisplayTime=1;
s = daq.createSession('ni');
s.Rate=5000;
addAnalogInputChannel(s,'Dev2','ai11','Voltage');
lh = addlistener(s,'DataAvailable',@plotData);
lh1 = addlistener(s,'DataAvailable',@(src, event)logData(src, event, fidData,fidTime));
s.IsContinuous=true;
s.NotifyWhenDataAvailableExceeds=floor(DisplayTime*s.Rate);
%Output
addAnalogOutputChannel(s,'Dev2','ao0','Voltage');
Fs=s.Rate
t1=100;
t = 0 :1/Fs : t1-1/Fs;
A=0.5;
data0 = A*sin(2*pi*t*159.2)';
b=repmat(data0,5,1);
queueOutputData(s,b);
datagiver = addlistener(s, 'DataRequired',@(src,event)...
src.queueOutputData(b));
figure(1)
clf
startBackground(s);
%%
s.stop
fclose(fidData);
fclose(fidTime);
%-------------------------------------
Please help if you have an idea. I need to do this because im making a controller for the magnitude value.
Regards
Ali

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