I have a zumo 550 and an ipod that i play thru the aux input on the front of my HK radio on 09 UC. The zumo also is an MP3 player as well. Whatever device I play, I only get sound out the left front and rear speakers, nothing on the right side. All other radio functions play just find on both sides. I suspect its something simple, but am at a loss. Saw a lot of ipod threads, but nothing on my problem. Suggestions pls.