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2 videos. Ranked by independent recommendations, not by views.

1. 

   1 Circuit Skills: LED Color Organ

   Make: 4 people · 4 months · since Sept 2012

   An older walkthrough of a three-channel colour organ with a schematic, suggested as a template for sound-reactive lighting without a microcontroller.

2. 

   2 How To - Whistle Controlled Arduino

   Kevin Darrah 3 people · 3 months · since Mar 2015

   Suggested as a clear walkthrough of boosting a microphone signal with an LM386 and filters so an Arduino can respond to whistling.