Question Is it possible to use the Pitch Shifter in the G-Major 2 to change the tuning of the whole guitar  Answer Yes and no. It is possible to retune the guitar up or down as much as two whole octaves (2400 cents) using the Pitch Shifter, but because this feature is based on pitch detection, doing so will introduce latency and pitch errors that will result in warbling, particularly when playing more than one note at a time. However, it does work when you only play single notes on the guitar.