I found this 14 band spectrum analyzer project on YouTube, but starting wondering. how can a Arduino with only "data", control 14 bands with 20 per band, 280 LEDs total. How does
Arduino Spectrum Analyzer on a 10x10 RGB LED-Matrix : 4 Steps (with Pictures) - Instructables
Spectrum Analyzer with RGB LEDs - Arduino Project Hub
Arduino spectrum analyser and light organ – Cassiopeia Ltd
Arduino 8 Band Neopixel Strip Led Spectrum Analyzer Circuit – Electronics Projects Circuits
Building an Arduino-Based Spectrum Analyzer - LED Matrix