Jim Frazier's response horrified me.
The answer should be as simple as saying "Put the gain plugin first on the track and click the phase invert button." That's it. Switching the cables in the cord? Re-exporting another audio file? Using the environment to put a plugin object on the... what? If there's one simple way to do it, why come up with four hard ways to do it that do EXACTLY the same thing?
Sorry, didn't meant to sound like I was complicating matters... : )
If the mic pres had a phase flip switch, this could be taken care of at that point, and never mentioned or thought of again!
But because Christopher doesn't have mic pres available that have phase flip switches, he has to improvise. Putting a Gainer plug-in on the bottom snare channel, and then flipping the phase button will only work for monitoring. It won't
record the bottom snare track that way.
And if the project is going to start and finish in Logic, with Christopher engineering the whole thing, then that's really all that needs to take place. So yes, it can be that simple.
But if the tracks are going to go elsewhere, then the recorded signal really should reflect the inverted phase, which requires a bit more effort, because, the phase couldn't get inverted on the way into Logic.
Hope that made sense...