This looks like a better mouse-knob interactor, e.g. use the mouse for
pointing/selecting, and then use this knob for simultaneously
controlling multiple parameters on the selected channel at once.
http://www.3dconnexion.com/products/spacenavigator.html
"push, pull, twist or tilt"
someone needs to build a driver that outputs MIDI controllers for every "axis"
-- Niels
http://nielsmayer.com