MXR M169 Carbon Copy Analog Delay Go from crunchy echoes to epic delays with the MXR Carbon Copy Analog Delay. Featuring 600 ms of delay time with optional modulation, and a three-knob design that controls Delay, Mix, and Regen. There are also two internal potentiometers offering user-adjustable width and modulation speed control for even more tonal options. All powered by a completely analog audio path for an authentic rich, warm analog delay, made possible only by old-school analog bucket brigade technology. True bypass.