usb cable adapter

Hi everyone Was listening to music through my iPhone yesterday and suddenly at traffic lights the music stopped and a loud buzz/hum/crackle started to come out through the speakers with a slight hint of music coming out the right speaker. I thorght it was the apple cable that may have broken...

I'm wanting to listen to music from My phone in the car and change tracks with the wheel, AUX cable lets me play music but not change tracks with the wheel or anything apart from The phone it self. I've searched the net and it seams in the middle arm rest there's a usb slot on the left of the...