8-fader Expansion Board for the Mackie Control Universal. The Mackie Control Extender Pro is a control surface extender that expands your Mackie Control Universal Pro unit with the addition of eight motorized, touch-sensitive Alps faders, plus V-Pot rotary encoders and push-buttons on every channel strip. The Mackie Control Extender Pro module attaches seamlessly to the Control Universal Pro unit, integrating with all the main control surface's functions and commands without the need for any external hardware. You can expand your MCU's ability to control your DAW even further with the addition of the Mackie Control Extender Pro.