The guts of this are controlled via an Arduino Mega 2560, with copious amounts of hot glue on display in true hacker style.

The keypad next to the screen has been replaced with 10 arcade-style buttons soldered to a scrap of perfboard, though in the end [tommycoolman] covers them with a very professional looking printed ...

It's of course backwards compatible with existing Arduino add-ons, but sets itself apart with a new USB controller with lower latency and driver-free operation on Mac and Linux.

“TheMIDInator is a MIDI controller based on an Arduino MEGA 2560. It uses a few potentiometers, rotary encoders, a joystick, switches and a keypad as inputs and sends MIDI commands via serial ...

Some of the parts you will require include an Arduino Mega 2560, 2.4 inch TFT touch Screen LCD with inbuilt SD Card Slot, 4GB MicroSDHC, 20 Pin ZIF Socket and others.