I need some help guys, I've recently noticed that while listening to certain tracks on my iPod (Aux input) the sound comes out of the speaker with what I can only describe as a karoake effect, with basically non-audible vocals and the instruments sounding perfect. I have the stock harmon kardon system and I know that it responds to poor reception conditions by repeatedly alternating between the stero and monophonic modes, but it doesnt help with eliminating the problem when it is turned off either. Is this something that Im just going to have to eventually tolerate?