separation as you know, since you are a guitarist, you can certainly go crazy with different ways of miking your guitar for both mono and stereo applications. I certainly prefer the fast and simple way of slamming a SM 57 onto a cabinet and if desired, some other Mike's for the room if I don't create a room electronically/digitally. Even when you don't believe you have a terribly good sounding room, a room microphone, with a little delay on it sounds a lot different than without the delay. Plus you can also send that room microphone into a digital effects device, adding some early reflections, delay, extra verb and turn it into something that never was.
Of course the bottom line is how it blends with the rest of the instrumentation? It's difficult to reproduce the instrument as it appears live so we are trying to reinvent it, in an acoustically compelling way. You never really end up doing what you think should be done because nine times out of 10, it won't sound right with everything else.
I'll blow an amplifier before I'll blow.......
Ms. Remy Ann David