A sixteen-pad drum sampler where the whole kit morphs at once. Every pad holds three versions of its sound, and one triangle control moves all sixteen pads between those three faces together.
The idea
A morphing sampler usually morphs one sound. Tetra Box morphs a kit. The three corners of every pad are aligned across the machine: corner one of the kick, the snare and the hat all belong to the same theme. Because the corners agree, one position on the triangle means the same thing for every pad, and dragging it walks the whole kit from one coherent character to another.
These are one-shots, so moving the triangle does not bend a hit that is already ringing. It changes what the next strike plays.
