DiscoJar: a Sound Reactive Lamp With 288 RGB LEDs
This is the source code for my project at:
https://www.instructables.com/id/DiscoJar-Sound-Reactive-Lamp-With-288-RGB-LEDs
You need a current version of the FastLED library (14.5.2017 FastLED master or later), since older versions contained a bug that caused the Teensy to hang after a while.