a piano tuning system having an electronic control circuit which receives sound through a microphone for a piano key . based upon a comparison of this sound with stored piano fundamental frequencies , signals are sent to a drive unit . an electrically driven drive unit has a push / pull solenoid with an actuator which can move an internal drive shaft along a spline shaft . movement of the drive shaft with respect to associated clutches moves any of three worm gears , each having dependent tuning head wrenches which turn the piano &# 39 ; s tuning pins . adjustments may be made to the spacing between worm gears to squeeze or expand their relative positions with respect to each other by an external housing thumb wheel . a method for implementing the tuning of piano notes is also set forth .