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This board is useful when you need more than 3 analog inputs. It can be daisy-chained to grow into bigger MIDI system. It has 12 analog inputs, that can be used to scan potentiometers, or external voltages, so it can be treated as building block for VST knob box, control interface for virtual instrument or CV-to-MIDI converter useful for recording voltage signals.
This board desn't have MIDI connections onboard, it needs master controller like MRG3, or MBBS to work. It just adds more analog inputs to your system built with midi-hardware.com boards
The board has 1 black connectors, as shown in the photo above. All inputs are groupped there, with addition of 0V and +5V pins to simplify potentiometer connection. See the schematic: