Well, I unfortunately havent gotten around to satelite radio. (bought new golf clubs instead).
There is no aux. input via the cd changer connection because for a cd changer to function, it has to be married to the car. (so you cant just put any random saab cd changer in and have it work, making stealing the cd changer from one of our cars basically useless. head unit also.) On the 9-3 boards, someone has found a way to hack the head unit to use the telephone inputs on the circuit board as aux. inputs. I have had my head unit opened up twice now, looking for some way to do something similar. I think i might have found it by way of the left and right leads coming off the tape deck (who uses it anyways). so when i get around to having time to open the stereo back up and soldering some cable to it to test it out, i will let you all know whats up with it. if i screw up my tape deck and it doesnt work anymore, at least i know that i never use it anyway.
if my guess on the tape left and right outputs doesnt work, then for now its just FM modulation to get the sound to your head unit, but I WILL figure out how to run some kind of aux. input into the stock head unit...eventually
also, if youve got a cd changer and its hooked up and works, you can hack the cable that goes from the changer to the head unit and solder some leads into it fo the left and right inputs. if this is your case, send me a pm and ill hook you up with the info on it.