Nicolas Toussaint has made a two channel audio meter using a Teensy 3.1, a PJRC audio adapter and two strips of NeoPixel strips from Adafruit.

An audio meter is an essential device in music production, displaying a visual representation of audio signal level. Toussaint has made DIY audio equipment using the Teensy before, and this time he wanted to try making an LED audio meter using a combination of the StereoPeakMeter example in the Teensy audio library with the FastLED library by Dan Garcia.

Toussaint’s helpful project post on the PJRC forum has a components list, his code, projects images and some great bonus information in a follow up comment from Rob Soles, the person behind the AudioPeak object.