When a solenoid key is pressed, the grounded circuit in the organ delivers current to the little R/C circuit, and this action pulls current through the 24V line (which leads out to a relay mounted on the device). The mounted relay switches the 110V AC activation power for the solenoid on and off. Once triggered, the 110V AC source gets rectified into DC current and is delivered to the solenoid, causing a hard strike against the pillar to occur. The strike time of the solenoid is regulated by the R/C circuit and is tuned for about a half second strike. The other benefit of using the capacitor/resistor circuit to initiate the strike, is the effective feel caused by the fill time of the circuit. Due to the fill/discharge rate, faster repetitious key presses have less power compared with a slower press, giving the feel of analog amplitude. The spring attached to the back recoils the solenoid for the next strike.