KR-Fatter STR is a modular hybrid plug-in processor that uses two different proprietary time- and frequency-domain DSP platforms in a single unit.

KR-Fatter STR can be used to enhance the spectral content of audio signals containing voice recordings, instruments, or synthesized sound. By using different combinations of the available modules, KR-Fatter STR allows for the creation of various effects such as Fattening, Spectral Coloring, Imaging, Harmonizing, Pitch Shifting, Delay, Modulation, and other special effects.

Special attention was paid in the design of this processor to the "naturally perceived" randomization of the available functions to produce a spectral evolution output. These randomizations, implemented using Fractal algorithms, can transform boring static audio signals into vibrant, rich, and natural sound recordings.

The available modules and functions can be used both in series and in parallel to achieve different results. KR-Fatter STR can create up to 4 additional stereo copies of the input signal that can be processed individually by applying modular effects and mixed into a final master stereo output bus.