I just installed a used Pioneer DEH-P6500 in my 1996 Subaru Legacy Outback. It turns on and everything, I can play a CD, change the channel, et cetera... Only trouble is that I can't actually hear anything! Has anyone else encountered this trouble? I'm thinking that it might just be something weird about the settings on the stereo itself (I've never had a stereo this high-tech before)... Like maybe it's just muted or something weird like that. Any thoughts?