Below is the CAD model of our prototype. It consists of three keys with functional four-bar linkages, three solenoids, three notes, and three sliders. It is capable of being played in two modes: play and listen. In the "play" mode, the microcontroller will read the position of the first slider and light the LED corresponding to that note on the keyboard. Once that key is pressed, it will move to the next slider and the process is repeated. This will continue until all the sliders have been read and played on the keyboard. In the "listen" mode, the prototype will play automatically. The microprocessor will read the position of the first slider and fire the solenoid corresponding to that note. It will then move to the next slider. This process is repeated until all the sliders have been read and the solenoids fired.

Below is an exploded view of the structure for the prototype. The base, left side, right side, key rod, key sensor support, four-bar support, solenoid brace, and xylophone plate supports are shown in this view.

The below video of the prototype shows how pressing the keys will swing the four-bar linkage into the xylophone plate. This is the mode of producing sound when in the "play" mode.