Hi. 2014 C4 Grand Picasso Exclusive: I cannot find how to connect the "Aux." facility to play an MP3. In the Media screen only "DAB", "FM" and "AM" are in bold; with the auxilliary icon in shadow. I had the suggestion that I should find the "Auxilliary volume" screen and may find that it is in the "off" setting, but it was actually set to "Max". Can anyone offer me any help in switching on this facility? Thanks.