Can someone explain why it's better to do guitars mono? I am recording a song and I have the input on my recording program set to stereo, but my distortion patch doesn't have any stereo effects anyway, so how does it make any difference whether I set the input to stereo or mono?
I could be completely wrong, but...
I think (unless using stereo FX before the mix) that recording guitar stereo helps to muddy the mix. Since you end up recording some identical tones at the same frequencies, they can cancel each other out. You could separate the stereo track, invert the polarity of one side, and recombine them to help a little bit, but I think a mono recording cuts through better still.
To use CD's 3D visual example...
Recording a guitar stereo vs. 2 mono tracks:
A mono track is placed in one place in the mix. Picture a bullet shot from a gun - it's traveling along only one path to it's target. That's your mono track. A stereo track would be represented by TWO bullets fired simultaneously, and though they might SOUND like one trail directly between the two, they're still in the mix in TWO places - not actually a true center.
I agree with Nick too, in that I like to double the rhythm track with a second recording (using slightly different guitar tones) and pan one to the left, and the other to the right. that gives it enough variation to not cancel each other, and still fatten up the sound.
A simple stereo chorusing trick for a mono track:
Duplicate a mono track in your DAW, zoom WAAAY in, and delete the tiniest bit possible. Invert one of the tracks, and pan one hard left, the other hard right. Watch out for mud though.