Matlab - Aumentar o disminuir decibeles

load handel; % 'handel' is a MAT-file which is shipped with MATLAB as an example

x = y/5; % Decrease volume

player = audioplayer(x, Fs);

play(player,[1 (get(player, 'SampleRate')*3)]);

x = y*5; % Increase volume

player = audioplayer(x, Fs);

play(player,[1 (get(player, 'SampleRate')*3)]);