The Seymour Duncan Catalina Chorus pedal sports a range of classic chorus and modulation effects, but really comes to life with its unique expressive dynamics section that responds to your playing. Standard rate and depth controls team up with a wet/dry blend, a tone control and a delay for a plethora of effects that usually requires multiple pedals. With the dynamic expression feature, you can make use of more extreme depth and rate settings, then control the intensity of the effect with how loud or soft you're picking.