I just recently recorded a song with 4 rythm tracks. 2 playing the first guitar part but each with different tones, and panned 100% left and right, and then 2 more playing a second different guitar part with different tones panned 75% left and right. Bass was centered with a touch of stereo chorus to widen it a bit, and the drums were centered with some stereo imaging done to open the center up for lead. It sounds very fat and full.