>> [y, Fs, bits] = wavread('drumpad-speech.wav');  

 >> wavplay(y,Fs) 

 >> sound(y, Fs, bits) 

 >> wavplay(y,Fs) 

 >> wavplay(y,Fs*10) 

 >> wavplay(y,Fs*2) 

 >> sound(y, Fs*2, bits) 

 >> wavwrite(y,Fs*2,'Fs2.wav'); 

 >>