Since I've had my phone I've always played music through an aux cable just connected to a speaker. For some reason when I plug the aux cable into my phone the music plays through my phone rather then the speaker. I know the aux input does work because when I put my head phones in I am still able to control the music using the buttons on the headphones but it still plays through my phone rather then the aux cable. I think it might be a setting but i can't seem to figure it out, please help!!! 