Still new to this tech. Tried an MP3 player for the first time this morning. Using the same aux. input in my Chevy truck stock head unit that works great with my Sirius Sportster. Anyway, I had to turn the truck volume dangerously high to even hear the music. Got to work, and noticed the player's volume was on normal. I've since set it to high, but not had a chance to go back to the truck. If that does not work, what are my options? Any chance my head unit has aux volume settings? Thanks for any help.