Need to put more than a spring in your reverb tank? Check out the Whirlyverb Reverb Guitar Effects Pedal from T-Rex Effects. Reverb is intended to emulate sound bouncing off the surfaces of a room, and the Whirlyverb was created to emulate sound bouncing off the most beautiful room you can imagine. The Reverb and Decay functions allow you to dial in just the right amount of effect. The Modulation feature allows you to thicken, twist, and distort that reverb effect to open up a new world of sonic possibilities.