Brass Tubes By Kunrad with the help of Technology for the Arts (Bass Jansson). Arduino Libraries Arduino-ESP32 (https://github.com/espressif/arduino-esp32) MD_MIDIFile (https://github.com/MajicDesigns/MD_MIDIFile) SdFat (https://github.com/greiman/SdFat)