Is there a way to adjust the output volume of the factory XM? It sounds good and all but with the volume set at say 20 and listening to XM, its comfortable. But if you switch over to FM or CD and leave the volume at 20 its twice as loud. That's an exageration, but it's noticeably louder. BTW it may say something about this in the manual but I never got one so don't flame me.