How to Tune a 12-String Acoustic Guitar By: Jim Jeffrey Updated on: April 05, 2017 More Articles How to Recover Your Facebook Account How to Treat a Calf Muscle Injury Knitting a Sweater: Neckline Stitching How to Get a PayPal Account How to Connect a Digital Camera to a Computer Related About the Author Jim Jeffrey is a Los Angeles/SCV-based multi-genre musician, composer, educator and engineer.