Traditional to the core, the VP1 gives you just a single rate knob plus a very cool Tone switch, which lets you invert the polarity of the effect. The effect of flipping the VP1's Tone switch lets you take it from a more traditional phaser to a more lush, almost vibrato-like effect. As for the rate knob, this allows you to dial in anything from a jet-engine sweep to the kind of psychedelic warbling that makes your guitar sound like a chattering robot.