By the way, if someone wants to try to emulate a CD changer, the only hard to find component is the magic female blue connector.
It's available from
http://stores.befr.ebay.be/ADAPTERSHOP : search for "blau" on the left and you should come across the following item (image (c) Adaptershop) at around 5 EUR + S/H.
Take care, other shops sell "mini iso blue connectors", but sometimes they don't include the contacts !