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Mackie Onyx 400f low levels

Ok, I just picked this guy up from L&M on the weekend and I haven't had much time to play around with it yet (2 hours) but I've noticed something that kind of bugs me. I plugged in an SM57 to record acoustic guitar with, just as a quick little test. I also plugged in a direct line from my guitars active pickup. Both lines were into pre-amp channels 1 and 2 on the 400f respectively.