The xfilter features stepped potentiometers for all its parameters throughout. The 41 steps make a precise recall very easy, and they provide a useful range of possible settings at the same time. And you will just love the feel of them, too ;-)
Stepped controllers are something you will usually only find on much more expensive gear, special mastering editions, or in most of the cases – not at all. The xfilter establishes this very handy feature in the regular serial version without any luxury up-charge.