This instrument is played robotically via 3 stepper motors, controlled by L298N H-Bridges interfaced with an Arduino Mega. The Braille 6-Dot interface box controls the input.
The only way to get sound from the instrument is to construct a Braille letter on the 6-Dot Braille input, interface. Any combinations outside the 26 letters and 10 digits will do nothing. This is the Braille letter I.