The DMM550 Deluxe Memory Man Pedal with Tap Tempo from Electro-Harmonix is a pedal designed with high quality, new old-stock bucket brigade ICs for an analog delay sound. In addition to Tap Tempo control of the delay time, the DMM550 also includes delay time modulation, an effects loop in the feedback path of the delay block, an input gain control, tap tempo divide, and optional expression pedal control over five parameters: Delay Time, Feedback, Modulation Depth, Rate, and Blend. This pedal is true bypass.