Matlab - Como seguir en el oscilograma el audio que se encucha

load handel %ejemplo

figure; hold on;

plot(y, 'b');

title('Osilograma');

yl = get(gca, 'YLim');

plotdata = yl(1):0.1:yl(2);

hline = plot(zeros(size(plotdata)), plotdata, 'r');

player = audioplayer(y, Fs);

set(player,'TimerFcn',{@llamar,gcf, plotdata},'TimerPeriod',0.01)

play(player);

function llamar(simisma, ~,figHandle,plotdata)

    hMarker = findobj(figHandle, 'Color', 'r');

    delete(hMarker);

    x = simisma.CurrentSample;

    plot(repmat(x, size(plotdata)), plotdata, 'r');

end

set(player,'TimerFcn',{@llamar,handles.axes1, plotdata},'TimerPeriod',0.01)