EarthQuaker Devices Data Corrupter for sale, in great condition, rarely used with original box. It is a guitar harmonizer, based on PLL. Data Corrupter is a monophonic analog PLL synthesizer. This device works roughly by brutally amplifying the input signal into a crushing square-wave fuzz tone, which it then multiplies, divides and modulates - resulting in expressive three-part guitar synth sounds sure to please all sonic experimenters.