This video posted on Twitter shows the testing of the cubes prior to the performance.
Andrew used a MSGEQ7chip to turn incoming audio and break it down into seven frequency bands. The data is sent to a Teensy 3.6 to control and assign colors to the LEDs lighting up the cubes. The result was an art installation that translated orchestra sounds into colors – blues purples for bass frequencies with higher frequencies in red. Each cube will also get brighter or dimmer depending on the volume level of the music.