The Keeley Synth-1 is a guitar-triggered Reverse Attack Fuzz Wave Generator that allows guitarists to create fuzzed-out synth waves. It features a Filter Control for tone adjustment and an Attack knob to control the lead-in time or swell of the note. With the Blend control, users can mix their guitar's natural tone with the synth fuzz effectively. The pedal is capable of producing sounds ranging from churning slow-gear reverse swells to sharp, light saber-like tones. Additionally, an expression pedal can be used to control the Filter, providing Wah-Wah-like capabilities. It is a versatile effect with three wave shapes: Sine, Sawtooth, and Square, designed to unleash the creative potential of guitarists.