Early fuzz boxes were designed to emulate the sounds of the saxophone.
The Zippy will allow you to channel your inner Coltrane with very reedy fuzz tones. Saxy and sexy.
At lower settings a nice musical razor blade fuzz sizzle.
Turn it up and it becomes an increasingly sharper toothed saw blade fuzz. It snarls. It spits. It goes from fat and thick to thin and cutting without losing it's signature top end sizzle and low end rumble.
The body control (bass cut) makes it easy to dial in just the right amount of beef. Zipper fuzz tones bloom and softly decay.