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El-VU-Meter

Whipped this up for Halloween 2011. I'm thinking of making it into a costume.

Sparkfun makes a pretty neat arduino shield that allows high speed control of EL Wire.

I've had this one for awhile. Macetech sells a shield that give you access to sound volume on analog input pins 2 and 3 through a standard audio jack.

Stack the two together and you have yourself a pretty neat setup.
An AnalogRead(2) will give you the current volume, then it's just a matter of selectively pulsing the EL-Wire outputs.