The sound in this video is one sample of an ice txalaparta made by Oreka TX for the Nomadak movie, going through a Boss RV-6 reverb pedal.
You can see it here:
Inside the planks there are piezos connected to a drum module. This drum module generates the midi that goes to the Axoloti. The axoloti receives the notes and plays the sample going through a low pass filter whose cut frequency is determined by the velocity of the note, making it feel more natural. At the same time, the Axoloti sends these midi notes to a teensy that drives the led strips (neopixels).
I made a custom object for being able to choose the scale we play, controlled by three rotary switches (scale, base note, and octave).
If you want to know more just ask