HUI MIDI mapping protocol
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The HUI(tm) MIDI mapping protocol is an open communications protocol for interfacing between a hardware audio control surface and digital audio workstation (DAW) software. The protocol allows a DAW and a connected hardware control surface to exchange Midi signals that synchronize the states of their (virtual) sliders, buttons, wheels, and displays.
This protocol seems to have been created by Mackie for their Human User Interface (HUI(tm)) product in 1997. It is now used very widely. Many hardware controllers (Tascam FW-1802, Mackie Control Universal, Yamaha 01X, Alesis MasterControl, SSL AWS900, etc.) implement this protocol. Similarly many types of DAW software implement the HUI(tm) protocol, making them cross-compatible with the HUI(tm)-compatible hardware controllers.