Kontakt-only library of tweakable waveforms in a simple and well-designed UI. A run through the presets shows off capable variation and I found several of these to be instantly useable. The ability to tweak separates 'Mutate' from typical sample packs and everything from sublime bass patches to aggressive screech territory is on offer as well as lots of excellent chiptune-natured sounds. Some of the harsher edges feel almost retro now yet so many great fresh sounds await too making 'Mutate' a keeper of an instrument.