Hello! I bought this for my Clarion car stereo adapter mounted on Peugeot 307. The cards fit properly but could not find a manipulation that allows me to listen to the sound of my mp3 on the radio. In fact I plugged the adapter in place of the multi-CD changer. By pressing the right button sound. The radio seems not to recognize the source. If someone has a tip, it would be welcome. So I change my note. Sincerely.