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Ok, so I've been in the eternal hunt for a summing box, and I've been wanting to get into the 500 series stuff too. Is this my answer? My main question is this. Can I use the box as a stand alone summing box without having anything in the slots? Also, has anyone heard this thing as a summing unit yet? How does it sound? Color? Anything?

ps. Please don't bite my head off if this is in another thread. I looked and couldn't find this. Thanks