I'm building a custom Flanger effect in an AD1701 and keep getting background noise when there's a signal present. It sounds something like crackling but isn't a digital chatter. I seem to have narrowed it down to the VC Delay blocks when the control voltage is changing quickly (on the order of a few Hz)
Is there a maximum speed the delay blocks can change at or an easy way to mitigate this problem?
P.S. I am aware that there already is an ADI Flanger effect but I need one with more end-user control.