The Mackie Extender Pro is an 8-channel control surface extension for the Mackie Control Universal Pro. Thanks to their unique proprietary communication protocol, Mackie Control Pro Series controllers know just how to sweet-talk your music software, and your software knows just how to respond. You get deep, intuitive control of mix and plug-in parameters, real-time visual feedback, and setup is plug and play--no MIDI mapping head games! <br /> <br />The Mackie Universal Pro control surface, Extender Pro control surface extension, and C4 Pro plug-in and virtual instrument controller all seamlessly integrate, so you can put control of all your software parameters right at your fingertips. Simply put, Mackie Control Pro Series controllers give your music production software what it needs to feel complete.Proprietary Mackie communication protocol for seamless software integration by DAW makers <br />100mm touch-sensitive optical Penny + Giles motorized faders <br />Multi-function V-Pots for fast control of panning, effects levels and more <br />Channel mute, solo, pan, send level and record arm functions <br />Full meter display with track names and parameters