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This mini board is MIDI control electronics converting multiple keyboards, or sets of potentiometers into MIDI. It has no keyboard scanning ability on board, instead it works with up to 5 scanners of any kind. Equipped with scanners it creates midi hardware required for up to 640 keys in 10 keyboards plus 64 potentiometers and 100 dual-line character displays. Typical applications are MIDI controller for VTPO (Virtual Theatre & Pipe Organ) like Hauptwerk, MidiTzer, as well as custom MIDI controller surface for Ableton Live, or Reason and many others
The board shown above has 5 connectors for scanners, two MIDI sockets, and screw terminal for power supply. There is also 6-pin header for connecting the "EDIT" button, and optional external activity LEDs. There can be 5 chains of keyboard scanners (only up to 2 per chain), and 1 chain of potentiometer scanners (up to 64 pot inputs total).
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