I have a 2006 Mustang GT Premium with the Shaker 500 6 CD Player. I ran into some issues last week when I put in a couple of CDR CDs which apparently were not recorded in the audio mode. These CDs could not be read and I had problems ejecting them. I finally was able to dislodge them and get them out of the CD player and noticed a message indicating that the CD player was "Initializing". Now when I play my CDs the volume changes both up and down something that has never happened before. I'm going to eject out all of my CDs and run a CD Head CD Head Cleaner disc to see if this will eliminate the crazy volume changes I'm now getting when I play my CDs. I have now recorded my home made CDs using the proper "audio" mode and they do work on a CD player I have in my office radio/CD player so I believe that they will now work in the Shaker 500 CD Player.