I hooked up my Mp3 player to my stock head unit which has red and white RCA hookups for my CD changer in the back, the problem is now I can't use my CD changer unless I take out the head unit and manually switch the plugs. I have splitters so that both the Mp3 player and CD changer are connected, but now the sound is mixed, I was wondering if there is any way to put a switch on the cables coming from the CD changer.