How to perform ook modulation on audio?

I have found the code below but i don't know where to change it for audio.

Audio

x = audioRC(audioSrc());

x = x(1:spf,1);

function ookd(g,f)

%For more information, visit: www.matpic.com

%Modulation OOK

% Example:

% ookd([1 1 0 1 0],2)

%Author: Diego Orlando Barragán Guerrero

[e-mail]

%Loja (ECUADOR)

%Long Live Heavy-Metal

%See also:

%http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=14328&objectType=FILE

if nargin > 2

error('Too many input arguments');

elseif nargin==1

f=1;

end

if f<1;

error('Frequency must be bigger than 1');

end

t=0:2*pi/99:2*pi;

cp=[];sp=[];

mod=[];mod1=[];bit=[];

for n=1:length(g);

if g(n)==0;

die=zeros(1,100); %Modulante

se=zeros(1,100); %Señal

else g(n)==1;

die=ones(1,100); %Modulante

se=ones(1,100); %Señal

end

c=sin(f*t);

cp=[cp die];

mod=[mod c];

bit=[bit se];

end

ook=cp.*mod;

subplot(2,1,1);plot(bit,'LineWidth',1.5);grid on;

title('Binary Signal');

axis([0 100*length(g) -2.5 2.5]);

subplot(2,1,2);plot(ook,'LineWidth',1.5);grid on;

title('OOK modulation');

axis([0 100*length(g) -2.5 2.5]);