Boss DD-20 Giga Delay You'll find the Boss DD-20 Giga Delay awesomely powerful yet easy to use. 11 delay modes include up to 23 seconds of classic tape delay. Sound-on-sound recording makes it as fun as it is flexible. New Smooth and Twist modes add subtle or radical effects while a memory function provides seamless transitions. Push-button knob lets you make fine or coarse adjustments to delay time.