Greig Stewartt (Theremin Hero) shared this video demo of a custom dual-necked chiptune keytar, The Blade.
The Blade uses two Game Boys, running custom ROMs, to become a fully playable instrument.
The shell is 3D-printed and the necks were repurposed from old guitar hero controllers. All buttons are re-mappable in code. The Blade can function as a pure MIDI controller, as well as routing the MIDI direct to the Game Boy chips.
The Blade was created by Sam Wray, Siddharth Vadgama & Greig Stewart.
The music is a chiptune cover of Starmachine 2000 by Wintergatan.