I have a clarion CD player in my crappy car....it has a button on it that says " Satellite Key" the button does not do anything its like an optional thing or something. the Radio is a Clarion DRB2475. My question is...I guess this radio or head unit for the radio is Satellite ready or something. Can I hook my new Sirrius Sportster into this radio somehow with a direct connection or enable that key someway? Thanks!!!