Aurora is a reverb effect pedal with four knobs to control the reverbation and three types of reverb. Decay controls the amount of time it takes for the reverberated sound to disappear. Keeley´s provides a range from a realistic, close-quarters reverberated dimension to a walk-away-and-come-back signal of complex, still-ringing musical reflections. The Keeley Aurora Slap back setting provides you with a sufficient range of time, from zero milliseconds to 100 milliseconds, ample time considering a pedal-board footprint this small. Dial up the warmth. Opposite to most tone controls, ours increases the warmth, as it is a dampening control. Its brightest setting is when completely dialed down. Blend will take your 100% analog dry signal and blend in the reverb, from just the slightest mix of wet to much more. The Toggle Switch: The three most popular reverb styles Room, Plate, and Hall.