[adriangin] wanted to control the synthesizer over MIDI, but their Casio keyboard only had MIDI over USB available. To get around this, [adriangin] set out to add a standard MIDI Out port to the ...

The Casio SK-1 keyboard is fairly well-known ... but with the added ability to “forge” the data going back to the keyboard to make new sounds. The result is what you hear in the video linked ...