Haybur has shared a template to help developers get started with Teensy-based music visualization projects.

While it is designed for use with a custom PCB, it can be adapted to any Teensy/Audio Adaptor Board project. The project assumes a 16×16 LED matrix, and takes care of all the FFT beat detection and timing, facilitating animated responses based on the FFT data.

Pattern lists allow the storage of animations for application to various triggers or situations.

But this is just a starting point — Haybur has used this system for large installations such as the two 4×4′ panels below, and more. The template is available on GitHub, and more information and pictures can be found via the original forum thread.