VC F3DB stands for Voltage Controlled Fixed Filter Feedback Distortion Bank. The simplest description is it's a 6 band voltage controlled fixed filter bank. But with the additions of so much gain, clipping, feedback, and self-oscillation it becomes a very flexible and unique sound sculpting tool capable of; graphic equalization over 6 octaves, multi-band distortion, spectral processing, crude vocoding, self modulation, and even as an instrument on its own. With no input it can be used as a pseudo chaotic "harmonic" feedback oscillator.