More MIDI, less Joy

Mad Katz Street Fighter joystick. It's not really what I want, but I do just want a ball on the end of a stick as an X/Y controller. Replacements sticks do exist for it.

Fergo Joystick MIDI seems like a practicable software solution to getting X/Y data into a DAW.

Some people have used game pads.

Musikalisches Würfelspiel -- even Mozart wrote music by chance.

Details for DIY joystick implementation. 

GIZMO is an open-source MIDI device thingy.

PACMOD MIDI DJ Controller is pretty much the thing, but it's entirely DIY Arduino. 

ControllerMate is Mac OS only. 

MultiControl is... something.