We've even got these in the AE environment, thanks to a 3rd party builder in the UK. 3 x 3 matrix, 2 spaces, and like most all AE things, it's stoopid-cheap. Mine's mounted in the "control" cab (a single row, 20 space case...the rest of mine are dual row, 20 sp) alongside the joystick, since I tend to view matrix mixers as controllers. Nothing like using a couple of knobs to alter the behavior of an entire global patch!