У вашего броузера проблема в совместимости с HTML5
Pulsing and moving DIY stereo VU meter powered by an Arduino.
Check the build over here: https://youtu.be/QUnB4OGLlog
Check the hackster link over here: https://www.hackster.io/ericBcreator/stereo-neopixel-ring-vu-meter-b28e78