Please can you help me understand it with the steps in simple way please please...

www Matlab Exercise: Create a .wav file of your own voice by reading and recording the letters A, B, C and D. (You may use the application audacity' for this purpose Read the file from matlab. Find out the size of the matrix. Plot the .wave file. Find out the length of recording from the plot. Play the sound file from matlab Work on the matrix so that the letters B and D will be audible on one track only while playing Work again on the matrix so that the letters B and D are eliminated completely from the wave file