First, I tested each of the Factotum's effects separately. The octave was smooth and buttery, and tracked to a degree that I would say was slightly above average for an analog octave. To create an octave-down signal, a flip-flop circuit converts a bass's output into a square wave whose frequency is divided in half to derive the octave-down effect. Since the harmonic content and gain of a bass's input signal varies so widely, analog octaves are not flawless. Yet, this is part of their quirky charm. While most analog octaves use some variant of the flip-flop-based circuit, there are further elements, like lowpass filtering and various gain-boosting strategies that distinguish each pedal from the other. The Factotum is a relatively sub-y octave, with a creamy and deep quality that's less synth-like than, say, a Boss OC-2.
Herrera, Jonathan (2015) Red Witch Factotum. In: Bass Player, Vol. 26, No. 2, pp. 64-65. Available at https://openmusiclibrary.org/article/1029362/.