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Fracture is like an older sibling of its slightly more basic relative, the delay plugin Hysteresis. Whereas Hysteresis has a low pass filter, Fracture gives you a multimode filter, also adding 3 LFOs and a buffer effect. Basically, when you involve this in an audio chain, the audio will become unclean...mutated...freakish. Add new textures to your sound, scour your pristine atmospheres with steel wool, give your vocals digital anomaly after effects. The fact that this and Hysteresis were free encouraged me to buy other Glitchmachines plugins, and I have yet to be disappointed.
TL;DR - A great way to mess your sound up.