Have any of you Spark drivers played music on the Spark's radio from a MP3 player? I have a Sansa Fuze MP3 player and it has tons of my favorite music stored. However when I connected the MP3 player to the USB port in the car, it would not see any music files from the Sansa. It however was electrically connected because the Sansa player indicated it's battery was getting charged by the car's electrical system, which jives with the car manual. The cable I used to connect the MP3 is the same I use to connect it to my computer and it works fine. Since the Spark did not come with a CD player, the