See Your Beats
Blinker grew out of a need for us to see the beat of the music when playing with a band. This device makes it easy to connect Ableton's metronome to Arduino quickly. It currently comes in two flavours: Basic and RGB.
This is the best place to start as it just blinks a LED to the beat of the music on a digital pin
After getting the basic LED working, now the fun begins with the RGB Rainbow light.
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Step off George, i'm a big kid who can get all the updates using github.
Next update will be the Looper version which monitors the state of the Looper effect, so you can perform without having to look at your monitor.