My car has the CD-changer-ready stock radio system. I currently have a FM modulator for my MP3 player but the sound quality is pretty mediocre. I would like to add a music player/aux-in so I was browsing through what connections there are. The CD changer is controlled through the i-bus but the audio connection seems pretty basic. Would it be this simple to tap into the line-out from the back input of the radio to the CD-changer to a 3.5mm jack on a music player? I have seen an Alpine M-Bus to 3.5mm cable, but I'm not sure if by using only that and plugging the player I will have sound. I think that the changer (if it had one)sends some kind of signal to the radio saying that it is there and can be used. I don't know if the same thing will happen with the MP3 player or will it just sit there without sending sound. I think is just too easy to plug the cable adapter and hope for it to work. Does anybody have experience with this?