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If you're retrofitting a console with multiple keyboards and pedalboard, you can hook toe studs up to either an MIDI Control Unit (MCU) with enough SIB board inputs to hook them up.
Or, if you have our pedalboard, pedalboard switch kit, or an MKSC4a, you can get our toe stud junction board and plug that into the scanner of your pedalboard in order to get inputs for up to 16 toe studs.
If you don't have any of the above products, the final option is to use an MKSC1b parallel scanner board.