So I just converted over the Mac for my recording needs and I've never had this issue before: My signal chain is Guitar -> Audio Box USB -> Logic 9. I don't typically record guitars direct but I noticed this immediately after setting everything up and it's driving me nuts. If I apply a amp sim or effect within Logic im hearing both the processed audio and the direct line in over it and I cannot figure out how to make the direct line audio go away. When I play back recordings It's just the processed audio but this is still annoying as all hell. I've tried everything that I can think of just coming from windows but.. meh, I'm out of ideas.