EarthQuaker Devices Ledges Tri-Dimensional Reverberation Machine Effect PedalThe Ledges Tri Dimensional Reverberation Machine by EarthQuaker Devices is a versatile reverb effect pedal delivering three unique reverb modes, six preset slots, and assignable expression out control for endless customization. From compact room tones to infinite reflections, Ledges has you covered. Ledges houses three switchable reverb modes: Room (R), Hall (H), and Plate (P). Offering a unique blend, the Room reverbs longest setting is the Hall