Sound Demo:

Toybox is run on a Daisy Seed microcontroller, made by Electrosmith. The effect was programmed in Plugdata, an open source development environment based on Pure Data. Containing a built in compiler, Plugdata makes it very seamless to prototype, flash to the seed, and then test.

The actual effect is primarily a granulator. It triggers sound playback from a buffer at quasi-random intervals and can be tuned between random and consistent. There are a number of different ‘effects’ combined and built into different parameters.