Okay...so I did something I've never done before in all my years of taping: I accidentally plugged my left microphone into the right channel of my preamp, and vice versa. I realized the error when I glanced up about two minutes into the set, but that's two minutes too late! Is the fix for this simply swapping the left and right channels using Audacity (the software I used to record)?
Thanks!
Yes - just swap left and right in the DAW.
If you can't swap, convert to two nono files and copy/paste them into a new file the correct way round.
It's all very easy.