If there was a musical instrument in The Matrix, it would probably look something like the Octopulse.
The Octopulse was created for the Yamaha Musical Instruments Research Lab.
Here’s what they have to say about it:
It shows that noise is music and is the principal musician of »The Alien Noise Orchestra« (work in progress), being the first of 4 different looking toy instrument characters that all produce different sounds.
With this cuddly »alien bagpipe« you can control analogue sound synthesis through unconventional means, transferring movements into information for an analogue synthesizer to convert into cacophonous noises. This unconventional soundscape alters perceptions of what music could be and allows the electronic sounds of a synthesizer to be accessed by anyone.