In the words of EarthQuaker Devices:

Okay Brainiac, its time to put down that graphing calculator and get to work decoding your brand new Data Corrupter!
The Data Corrupter is a monophonic analog harmonizing PLL with modulation. It takes your input signal and brutally amplifies it into a crushing
square wave fuzz tone that is then multiplied, divided and modulated to
create a wild, yet repeatable, three-voice guitar synthesizer.

The Master Oscillator is the central nervous system at the heart of the
Data Corrupters cyberpunk hive mind. The three-position switch on the
Master Oscillator control panel labeled Root feeds your input to the
Data Corrupters signal harvester in its original octave (Unison), one
octave down (-1) or two octaves down (-2). Use the Master Oscillators
Root switch to fine tune the Data Corrupters tracking response for
maximum compatibility with your preferred instrument and frequency
register. Once youve chosen your input octave, the Data Corrupter will
perform its calculations and spit out a synthesized frequency, the
octave and/or interval of which may be selected via the Master
Oscillators eight-position rotary switch. The Voice Mixers Oscillator
control adjusts the Master Oscillator blend.