This tutorial shows how to use two microphones in an M/S stereo configuration to record acoustic guitar. One microphone is set to a cardioid polar pattern and faces the sound source while the other is set to a figure-8 pattern and picks up sound from the sides.
Watch to learn a great technique for recording vocals and acoustic guitar simultaneously. With careful attention to placement in order to isolate each sound source, engineer Bob Clearmountain uses a Neumann KM84 close to the acoustic guitar and a Neumann U87 for the vocals - both plugged into an Apogee Duet audio interface.
See photos and hear the finished track: apogeedigital.com/blog/record-acoustic-guitar-ms
Learn more about Apogee Quartet: apogeedigital.com/products/quartet