A very weird controller

''With this project I sought to produce an easy-to-make, cheap, digital controller inspired by the Ondes Martenot. Like the Ondes, I wanted the controller to give continuous and fluid pitch adjustments, a deep volume control, and offer a range of timbres.
...
All of the materials needed for this project are a Gametrak video game controller, a copy of the programming environment Max/MSP (found at Cycling '74), and a few sundry pieces available at any hardware store.'' [source]