I'm using FastLEDs to create a light-up guitar neck.

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I’m using FastLEDs to create a light-up guitar neck. My first version used shift registers and single-colour SMT LEDs. But this new version not only shows to scale patterns, but allows you to highlight specific notes within the scale- great for targetting root notes, major/minor thirds and more!
http://nerdclub-uk.blogspot.com/2015/11/testing-resin-cast-guitar-neck.html

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So many great lighting possibilities there. Cool.