savewave save data into a sound wav file. savewave(filename,x [, rate , nbits]); filename a string. The path of the output wav file x a mxn matrix where m is the number of channels and n the number of samples for each channel rate a scalar giving the sampling rate (number of sample per second) 22050 is the default value. save x into a wav sound file. you can transform other sound files into wav file with the sox program. loadwave analyze mapsound