first off, can the Booster be used as straight up overdrive (at lower volume levels) or not? if the answer is no, than I guess it's the Preamp but yeah, anyone recommend one over the other for a nice transparent overdrive. I'm trying to dip into new stuff right now and I'm looking at this stuff as I see them on lots of boards. I like getting to hear string separation and picking dynamics. I've heard alot about both of these pedals, so can anyone narrow this down for me? thanks!