Data acquisition during a period with triggers

Hi,

I programm the following code:

duradaTotal = 10 %ara poso 10 segons
durationTrigger = 0.5 %durada de cada trigger (temps d'aquisició).
ai = analoginput('winsound',0); 
chan1 = addchannel(ai,1); %esquerra
chan2 = addchannel(ai,2); %dret
Fs = 44100; 
set(ai,'SampleRate',Fs)  %Defineixo el Rang de Mostreig el valor d'Fs.
ActualRate = get(ai, 'SampleRate'); %llegeixo quin Freqüència de mostreig tinc

set(ai, 'Timeout', 15 )
set(ai,'SamplesPerTrigger',ActualRate*durationTrigger); 
set(ai,'TriggerChannel', chan1);
set(ai,'TriggerType', 'Immediate'); 
set(ai, 'TriggerConditionValue', 0.2);
set(ai, 'TriggerRepeat', inf);

tic;
tStop = 0
%començo la lectura
start(ai) 
while tStop < duradaTotal
  tStop=toc
  wait (ai,duradaTotal+1 )
end
  [data, time] = getdata(ai); %agafo totes les dades que tinc del tots els triggers

if tStop > duradaTotal
 stop (ai);
end

remsamp = num2str(ai.SamplesAvailable); %num2str converteix els números en string

ai.TriggersExecuted %pinta tots els triggers que han saltata i quan
showdaqevents(ai) %pinta tots els triggers que han saltata i quan

%pinta per la Command Window el contingut de remsamp
disp(['Number of samples remaining in engine: ', remsamp]) 
%time=[0:tStop];
subplot 211;
plot(time,data); 
drawnow 
xlabel ('Time (s)')
ylabel ('Signal Level (volts)')
title ('Signal')
zoom
datacursormode on
hold on

I want to listen my analog channel during period of time (for initialize I put 10 seconds), and I want that when a trigger ocurrs, the system save this data during 0.5sec. Therefore I put the TriggerType as 'Immediate' and the TriggerRepeat as Inf.

How much time have I wait?

Other problem I have, is the data saved, because I program:

[data, time] = getdata(ai);

But only shows on plot the first period of data, and I want all the period.. (with all the triggers if there are more than one trigger occurred)

Thanks,

Roser