delay

Type: delay :: Pattern Double -> ControlPattern

delay turns a number pattern into a control pattern that changes the level of the initial delay signal. A value of 1 means the first echo will be as loud as the original sound.

d1 $ s "[drum cp]*2 jvbass" # delay "[0 0.5]/2" # orbit 1

As delay is a global effect, you will want to use it in tandem with orbit (unless you're only running one pattern at a time).