One twist of the Delay knob takes you from a tight 20ms delay to a cavernous 300ms. The Feedback control regulates delay duration and intensity. But watch out. Extreme settings can send the Aqua-Puss MkII into self oscillating psycho freak out mode! Meanwhile the Blend knob lets you set a balance between dry and delayed signal from mild to wild. The Aqua-Puss MkII delivers all the spooky mystery of vintage analog delay and tape-based echo, with none of the hassle of creaky, ancient gear.