Walrus have a formula for their pedal types, recent drive pedals all have a set design and the same applies to their modulation pedals however they are not the same as the drives. The three modulations in mind are the phenomenally popular Julia Chorus, the Polychrome Flanger and this, the Lillian Phaser.
The Lillian is a true bypass, all analog, multi-stage Phaser with Rate, Width, Feedback, and D-P-V blend knob which lets you blend between dry, phase shifted, and vibrato sounds allowing for a wide range of control over the intensity and type of effect. All the Walrus pedals hold a wealth of great tones within a tiny package and this is no exception to that rule!