Are you thinking what I’m thinking? Aside from making an interesting Max/MSP controller, this is perfect for controlling emulated Game Boy music, like LSDJ, which is available as a ROM for US$29.95. While I still prefer using a real Game Boy, the emulator saves money (no need for a classic GB cart), and I’ve been impressed by the sound output from KiGB, which runs on every platform on the planet. GB musicians out there, give a shout out and let us know what your rig looks like.
In other news: the New York Times has an ode to the brilliance of the joystick as a controller.