forgot all about that! I've never heard of "pneumatic" controls. Heard of pneumatic nail guns. 
True......throughout the history of aviation, I've never heard of an aircraft built with pneumatic flight control systems.....it just can't be done reliably and providing the level of leverage and force to operate control surfaces.
In the early years, flight controls were (and still are in some aircraft) operated by stainless steel cables and pulleys attached directly to the stick/yoke/rudder pedals......as aircraft became larger/faster, and the amount of force needed to move control surfaces increased, hydraulic systems were substituted for the cable system to accomplish this function......until FBW came along which is essentially the same hydraulic system simply substituting a computer and inputs from the flight controls to operate the system through hydraulic servos mounted at the control surface.......similar to a "joystick/game controller" in a computer game system.
The only "pneumatic" system ever used on an aircraft, to my knowledge, are the old-style artificial horizon and gyrocompass (on the instrument panel) which were driven by a vacuum pump on the engine, and, of course the pitot-static system for airspeed. These have been largely replaced by electronic flight directors, although most aircraft still carry them as a back-up for instrument flight.
doc
