Check out this video of a Tesla Coil producing sound with a range of 41Khz. This is inspiration if you are working or researching sound. The Tesla coil’s high voltage discharge act like speakers since the voltage displaces air to produce a certain sound.
The electric sparks produced by the Tesla coil are controlled by a MIDI micro controller which essentially does the same thing that the Arduino micro controller does for the WAM Box I made. The Tesla coil control comes from the frequency of the 1s and 0s being passed via 1 bit square wave modulation. In theory, I could incorporate the interface of my WAM Box and plug it into the Tesla coil to come up with a high voltage musical instrument that is controlled by a user using hand gestures. Unfortunately, I don’t have a Tesla Coil laying around.