How does EverTune “know” how to hold tune if it’s all mechanical?
EverTune is a totally passive system. All it does is pull the string with the same (constant) tension, regardless of the string’s expansion or contraction. We use a compact spring suspension system to accomplish this. The tuners on the EverTune bridge increase or decrease the tension with which the strings are pulled. Thus the player sets the tension (and hence tune) of each string.