While this isn't exactly the normal sort of NF article, this took me hours to work out.
I have a bunch of gigs recorded on an Zoom MRS-1608 recording desk. Until recently to capture/edit the recordings, I recorded the master-output via a Line-in connector on an iMac (into Soundtrack Pro). This worked fine, but all the levels were set on the desk, and mixed-down to a stereo output, which means to change the levels, you have to capture the song again. And there is no way of adding effects to specific channels and so on..
The solution should have been simple - Zoom have an application called "Audio File Manager", an extremely buggy and broken application that (should) take the recordings via USB, or a CD and convert each track to a .WAV or .AIFF file (which can then be edited in any audio application)