Upcycling a bluetooth speaker corpse (board and 7-segment displays were toast), re-stuffed the thing using:

• ESP32 MH-ET-LIVE
• XS-3868 from ICStation https://www.tindie.com/products/ICStation/xs3868-wireless-bluetooth-module5079/
• 2x SSD1306 64x48
• PAM8403 Stereo Amp w/ switch https://www.aliexpress.com/item/PAM8403-mini-5V-digital-amplifier-board-with-switch-potentiometer-can-be-USB-powered/32464197247.html

The ESP32 animating the Audiospectrum is running a slightly modified version of this project: https://github.com/G6EJD/ESP32-8-Octave-Audio-Spectrum-Display