The features are identical to the paid version of Instability, but presets can't be saved, and it will reset on reload.
Instability has two parts: pitch and amplitude. The pitch section applies a pitch shift, controlled by random modulation. The amplitude section changes the volume of the sound, also with random modulation. Each part has a stereo control, which will make the left and right channel be modulated differently. For modulation, Instability uses a smooth random signal. It is not any old signal though - we've made sure that it has exactly the right kind of random behavior. The random signal Instability uses has tempo control and can be tweaked to produce both incredibly slow evolving textures or quick warbly messes.