Whoever knows the answer to this gets a fabulous prize...
Right, my silly car came with a Delta radio and CD changer.
NOW it has a Symphony head unit in it, and doesn't register the Delta CD changer. You turn it on holding the mode button and it says "NO CDC" however the changer has power, and when you turn on the stereo you hear it check for CD's and flick through the cassette.
Obviously there are computability issues somewhere, but what I want to know is does the Delta changer have the same connector at the changers end as the Symphony?