IR Apple Remote, iTunes Volume instead of System volume

So the infered remote that comes with macs (not sure if they still do but no matter) only controls the system volume and I would like to controll the iTunes volume instead. I know I could really easily use the remote app but I have a universal remote that can learn the apple remote IR signals and I would like to use that one remote. Is there a program I can run on my Mac or can I edit some system code so I can make this happen? Please and thank you like always