May I ask can I change the value of the maximum amplitude of wav file and save as new wav file?

May I ask can I change the value of the maximum amplitude of wav file and save as new wav file? For example I want to change max1 and max2 to other value and save as other wav file after change it.

 [y,Fs] = audioread('test4.wav'); 
amplitudes = abs(y);
left=y(:,1);
max1 = max(abs(left)); 
right=y(:,2);
max2 = max(abs(right)); 
disp(max1);
disp(max2);