delayfeedback :: Pattern Double -> ControlPattern
delayfeedback turns a number pattern into a control pattern that changes the feedback level of the delay effect.
The delay function is required in order for the
delayfeedback function to have any effect.
You can use delayfb as a shortcut for delayfeedback.
d1 $ s "drum jvbass [cp arpy] jvbass:1" # delayfeedback "[0.1 0.5 0.9]/6" # delay "0.5"