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Ramsophone
Turn on sound, push buttons, refresh page.
Robert Vinluan made this. It uses Tone.js for music synthesis, Teoria.js for theory, and lots and lots of CSS. Named after Dieter Rams. And phones. Resemblances to the Stranger Things theme may or may not be intentional. Hit '0' for debug view.
http://robertvinluan.com/Ramsophone/