In a recent article about his Sixtyforgan (an organ made from a Commodore 64 and a spring reverberation tank), Linus Akesson explained how he had used the key l

In a recent article about his Sixtyforgan (an organ made from a Commodore 64 and a spring reverberation tank), Linus Akesson explained how he had used the key layout of a chromatic button accordion. This appears to differ from the Janko layout, though they both apparently share the feature that "if you know the shape of a particular chord or scale, you can automatically play the same thing in another key just by moving your hand" (so long as you have five rows of buttons, in the accordion layout.) There are many ways to skin this cat apparently, though as with QWERTY, established convention is hard to change. https://www.linusakesson.net/sixtyforgan/index.php https://www.linusakesson.net/sixtyforgan/index.php