I've developed a library specific for Teensy 4 + Audio Board to simplify the development of complex sound reactive effects for LED strips, and to provide runtime support for rendering simultaneous effects on multiple strips, controlling the transitions and adjusting parameters in real time via IR remote.
See GitHub repo for details and documentation.
https://github.com/lpaolini/Striptease
See GitHub repo for details and documentation.
https://github.com/lpaolini/Striptease