MATLAB. 3.3) please finish the following incomplete m-file using the function attached and show how to play notes. 3.4) please complete all parts (a and b).

3.3 Synthesize a Scale with Octaves In a previous section you completed the key2note.m function which synthesizes the correct sinusoidal signal for a particular key number. Now, use that function to finish the following incomplete M-file that will play scales where each tone is the sum of two notes separated by an octave play_scale octave.m scale . keys = [ 40 42 44 45 47 49 51 52 40 44 47 44 40]; % NOTES: C D E F G A B C C E G E C % key #40 is middle-c scale.durations0.25ones (1,length (scale.keys)) fs 11025; %-- or 22050 Hz xx = zeros (1, ceil (sum (scale . durations)"fs+length (scale . keys)) ); for kk = 1 : length (scale , keys) keynum scale . keys (kk) ; tone n2 = n1 + length ( tone) -1; xx (nl:n2) xx (n1:n2) tone; n1 = n2 + 1; end