Including Distortion with Audio Signal

I am new to MATLAB and am attempting to distort an mp3 file. I found code for distortion but I don't know how to implement the function with my signal. How do i pass the signal into the distortion? Distortion code I am using is below but I'm open to change it if need be.

function [y] = fuzz(x, Fs)

% Distortion based on an exponential function

% x - input

% gain - amount of distortion,

% mix - mix of original and distorted sound

%1=only distorted

gain = 11;

mix = 0.1;

q=x./abs(x);

y=q.*(1-exp(gain*(q.*x)));

y=mix*y+(1-mix)*x;

end

Answer 1

[Mathieu NOE]

hello

this is an example how to use your function within a main code

but I guess the implementation for the distortion is not correct , the result was making my ears bleed...

had to reduce "gain" factor but even then I got only "scratches"

clearvars;
close all;
infile='DirectGuitar.wav';
outfile='out_dist.wav';
% read the sample waveform
[x,Fs] = audioread(infile);

% normalize x to +/- 1 amplitude
x = x ./ (max(abs(x)));

[y] = fuzz(x, Fs);

% write output
% normalize y to +/- 1 amplitude
y = y ./ (max(abs(y)));
audiowrite(outfile, y, Fs);

figure(1)
hold on
plot(x,'r');
plot(y,'b');

title('Distorded and original Signal');
sound(y,Fs);

function [y] = fuzz(x, Fs)
% Distortion based on an exponential function
% x - input
% gain - amount of distortion,
% mix - mix of original and distorted sound
%1=only distorted
gain = 11/5;
mix = 0.1;
q=x./abs(x);
y=q.*(1-exp(gain*(q.*x)));
y=mix*y+(1-mix)*x;
end