Using a Korg nanoKEY2 USB MIDI controller as base for the device, [Geordie] took it apart and added a Raspberry Pi Zero W, a power bank to, well, power it, and a USB hub to connect a likewise ...

If you own any of the following MIDI controllers, you'll not only be able ... Novation Launchkey MK3/MK4, FLkey, SL MK3 KORG ...

Build a MIDI foot controller, of course ... are connected to a switch read by the Arduino which sends data to a Korg Microsampler over MIDI. The swell pedal from the organ was also reused ...