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Tuning a guitar, especially a 12-string guitar, is a delictae and time consuming process. The worse, you have to do it over and over again as a guitar gets out of tune rather quickly. In addition, perfect guitar tuining is difficult for many people. It is also distorbing for the audience during performance.
An instantly tuned guitar would be equipped with an electronic tuning device. You need just to push a "Tune" button, and the device would do the rest – instantly and perfectly.
I saw a famous guitar player changing his guitar after every song during a concert. I understand he had to do so because his guitar had got out of tune. He wouldn't have to do so If he had such an instant tuning device.