I have to say when i tried one I just set the controls to 12 o'clock and played it.
I suppose though, you buy it for that tone (including the 2nd deep bass channel), so it pretty much does what it says on the tin.
My most recent acquisitions have been an EBS Microbass 3 pedal which is really good and plays the role of an Fx board hub, with an Fx send/return loop, and a PHA valve preamp, which really augments the Rickenbacker's sound well and gives that low growl plus thickens the high end.