Kind of a n00b question. Did a few searches here on Talkbass and didn't find anything, but I'd be happy if one of you proved me wrong!. Something on Google explained what has been obvious to me; line out is typically 1/4", direct out is XLR. I'm looking for more elemental and pragmatic answers. Of special interest; Are they essentially interchangeable, or is each best suited for a certain task(s)? My curiosity was peaked because a new amp I'm in the process of buying has both. I'm sure I'll experiment on my own, but didn't know the technical aspects. Thanks gang!