You could make copies of pre-recorded tracks and set them up as I described earlier to mix as mid/side. I am going to try this with my drum overhead tracks to see if it works and to see how it changes the sound. This would be the ' side ' part.
Just remember to pan the tracks prperly, as described earlier. The left minus right / right minus left setup cancels out signals that are the same in both channels. This should make the stereo mix sound better, more open.
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