"Software Caddy" [mp3 removed -- a newer version is available on Bandcamp]
A slab of techno-primitivism (more than usual). All done in Reaktor - two sequences, some muting/unmuting of tracks. The variations are programmed into the presets (which I "tuned" to get this group of six percussion instruments) - don't know if there's any randomization or if it's LFOs sweeping various parameters - should re-read the manual.