ive got a question about signal processing. i want to take a tune, scale frequency spectrum and then play it back. main question is about scaling frequency spectrum. how can i scale all frequency range in matlab?

   %taking signal
ai=analoginput('winsound');
addchannel(ai,1);
set(ai,samplerate,80000);
set(ai,samplespertrigger,80000*10);
start(ai);
data=getdata(ai);