I have today fitted this very device, also from Amazon. Once plugged you will be able to pair your phone to the device called 'Bluemusic' - its as simple as that. I have to set my car radio to CD Changer Mode, and Bob's your dad's brother (or your mum's brother, of course).
Best I can do in the pouring rain I'm afraid. The whole lot is tucked back up behind the bulkhead carpeting out of the way. There is an access cavity behind the upright carpeting which leads in to the back of the centre console between the seats - if you loosen and pull up that carpeting you will find the two CD Changer connectors somewhere in that cavity. Once I've used the adaptor for a while and am happy its all working fine I will most likely pop the lot into that cavity.
I've been using the same adapter for over 4 years now. As far as pause goes, if you simply turn the radio off using the volume knob, audio will pause, and when radio is turned on again, audio automatically continues playing again.
Yes that was the next thing I tried today while waiting in a queue of traffic actually, and you are of course correct.
Rotterdam