The Moog MF-107 FreqBox is a unique analog effect that uses an input signal to modulate an internal voltage-controlled oscillator (VCO). Unlike traditional processors, it generates sound from a VCO with a continuously variable waveshape ranging from triangle to sawtooth, square, and pulse. The unit features hard sync, linear frequency modulation (FM), and an envelope follower that allows the input dynamics to control the oscillator's frequency and amplitude. It includes a comprehensive array of CV inputs and outputs for integration with other modular gear or expression pedals. Housed in a classic steel chassis with wooden side panels, it provides a wide range of synth-like textures, from gated fuzz to complex harmonic sweeps.