Hi,
in my opinion, the only thing you'll need is a midi adapter cable for your soundcard and maybe a midi cable extension if your keyboard is too far away from your computer. the adapter cable is usually connected to the joystick port of the soundcard. the other end of this cable has to be attached to the midi input/output plug of your t3. you'll be still able to connect a joystick to the soundcard because the adapter cable will have a plug for it.
hope this helped,
SiD