Fender Tune Support has a new home! Click here or go to https://tune-support.fender.com to visit our new support home. Related articles How do I restore the factory preset data on my Fender® Mustang™ amplifier? How do I update the Firmware on the Mustang LT amplifier? How do I update the firmware on a Mustang GT or Rumble digital amplifier? Contact Consumer Relations How do I use the built-in Tuner on the Fender® G-DEC 3 to tune my instrument?