link for RCA adaptor

I have bought and tested this product with my Archos Jukebox 6000 mp3 player and it works perfectly. Simply plug in the adaptor to the cd changer input, run RCA cables up to the front, press the function button on your radio to select for that device and you got mp3 quality sound running directly to your speakers. However, other than volume you have to control all other device functions from the device itself. I have seen another product that does allow you to use your existing radio interface that is compatible with most BMWs but not sure if it will work with mini. I would appreciate any input or guesses as to whether this device will also work with the mini. Here is the link for that device.
Phatnoise.com