Mad Professor Dual Blue DelayRich, fat, warm sound and well thought out functionality make the Mad Professor Dual Blue Delay one of the most clever, intuitive, and easy to use delay pedals currently available. The short delay has a maximum delay time of 315ms and a fatter tone well suited for slapback and old school tape echo tones. Long delay reaches 810ms and has a modern delay voicing, great for lead and ambient tones. Both delays have wide range Tone controls for dialing in