Transperformance ® has offered an auto-tuning system for decades. Adaption of the Transperformance system occurred because installation required extensive work to route and install multiple components.
Introducing the G-Force System as a factory-installed part of new guitars more or less forced consumers to at least try it. Besides ease of simple tuning, the G-Force electronics allow for easy non-standard tuning such as drop-tuning.
Wikipedia describes the workings of this system as, “The Gibson system uses the standard Tune-o-Matic style bridge typical on their guitars, but modifications were made to have individual piezo saddles that transmit each string’s pitch to the microprocessor. The computer analyzes the signal and then controls each of the Powerhead Locking Tuners. Each tuner is run by a small servo motor that works in sync with the bridge to bring the string up to pitch by altering the string’s tension until it is within the desired tolerance. The entire system is powered by a nickel-metal hydride rechargeable battery pack housed in the control cavity of the guitar.”.1