Most of the electronics that make the Stranger Reduction Zone play audio were made by Adafruit Industries. I polled their forum readers for advice on how to program the boards and amplify the sound. They were extremely helpful and they even blogged about my piece!
Read all about it here: http://www.adafruit.com/blog/2013/07/15/colorado-springs-art-installation-stranger-reduction-zone-features-adafruit-wave-shield/
Thanks Adafruit!
Adafruit Industries Wave Shield
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