Similar to the Chorus mod, just attached an Expression input to the rate knob. when you unplug the expression, the knob returns to normal. but on this bad boy you can get some SICK stutter rhythm effects. i'm a huge goatkeeper fan, but this thing will give you some options you just can't get with the goatkeeper, cause the effect is literally adjustable on your feet. you have to program the steps in the goatkeeper.