Fantastic project from scruss spotted at their blog. The code is open-sourced and could be easily modified for so many touch/play purposes, have a listen:
Since there are seven touch pads on a Circuit Playground Express, that’s enough for traditional 3-chord (Ⅰ, Ⅳ, Ⅴ) songs in the keys of C, D and G. That leaves one pad extra for a Ⅵmin chord for so you can play Neutral Milk Hotel songs in G, of course.
CircuitPython source and samples: cpx-chord_guitar.zip. Alternatively, on github: v1.0 from scruss/cpx_chord_guitar
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