MIDI keyboards already equipped with switches, pistons, and a scanner with MIDI-Out (MIDI-DIN or USB).
CMK3 Portable Wireless Remote Keyboard
This is a professional quality 61-note manual, that can be connected to any pipe or electronic organ console which has MIDI-In, to allow an organist/choir director/tuner/voicer to play the organ from anywhere in the building! It includes 24 configurable pistons.
The CMK-3B is a MIDI-based controller board that works with the professional wooden keyboards made by Fatar.