Earthquaker Devices Afterneath V3Take a moment to consider your Intelligence and Wisdom scores, as well as your spell inventory before proceeding further. You have seven spells at your disposal Will you cast Length, which controls the decay length of the reverb? What about Diffuse, which adjusts the spread of the reverb? With your wand (or just the knob) turned counterclockwise, the reverb is sharper with more attack, resulting in a stuttering sputter of individual early reflections.