I am going to record an artist and I am not sure how to go about his recording. I am going to have a drums panned left and right with snare and bass centered. The bass guitar also centered. A stereo recording of an acoustic guitar panned left and right and centred vocals with panned effects at lower volumes. Now I would like to add some subtle lead stuff such as arpeggios in the chorus with another acoustic guitar. Where would you typically place it? And, should I go for mono or stereo?