Fs=8000;
time=2;
[signal,Fs,~]=wavread('test.wav');
for i = 1:numel(signal)      %run through entire signal, variable i will be how many samples it took

end
i=i-1;
length=i/8000;      % total number of samples divided by Fs will give length of entire signal in seconds
if(time>length)
        error('time longer than sound');
end

i=1;
fadetime=(time*Fs)+4000;
while( i ~= fadetime )
    signal(i) =  signal(i)*i/fadetime;  %signal reaches max at when i reaches fadetime
    i=i+1;
end
disp(i/8000);
plot(signal);