The condition is good as it was used until recently. The FZ-5 faithfully models the characteristics of germanium transistors used in historical vintage fuzz pedals at the component level. You can switch between three different types of fuzz sounds with the knob. The F mode features a saturated low-end sound, along with a moderately mild distortion on the plain strings. The M mode perfectly reproduces the dirty sound of the earliest distortion models, while the O mode perfectly recreates a unique sound as if an octave-up sound was added.