I've started to notice that when I switch between sources (CD/iPod/XM/FM) it seems that the baseline volume changes from source to source. For example, if I'm listening to my iPod at a set volume (12), I have to turn it up to 14-15 when I switch to XM. Conversely, I need to turn down the volume before switching back to the iPod or it's uber loud. I've tried searching the forum and fiddling with the HU settings but can't find a fix. Any thoughts? Thanks!