Atari Punk Stick is a DIY project that puts an ‘Atari Punk Console’ synth into a joystick:

The problem with the Atari Punk Console is the interface; knobs can be fun but only keep me entertained for so long. A joystick on the other hand is a much more fun and active way to use interface. This Instructable will teach you how to combine the simple design of an Atari Punk Console with the fun interface of a joystick.

Details on the build are available at Instructables.