The Hydra combines high-fidelity Reverb and Tremolo to add space and dimension to your guitar, bass, or keyboard signal. After the team at Keeley completed the ECCOS, they wanted to craft the perfect companion pedal, and they did just that with the feature-rich blue box. Bathe your sound in Spring, Plate or Room Reverb, then add tap tempo-enabled Harmonic, Vibrato or Sine Wave Tremolo with the press of a button. You can easily change the order of effects, or the character of the Tremolo or Reverb with the Hydras smart Alt Controls. You can even create an Infinite Hold Reverb Trail. Save up to three presets with ease using the intuitive save feature. Engage Reverb Trails on the fly, no more internal dip switches. The Hydra can be used with pro remote switching systems and offers both TRS Expression Pedal and External Tap Tempo inputs. The Hydra is a complete end-of-pedalboard solution that fits perfectly in any musicians rig, regardless of genre. Experience next-level processing power in this pedalboard-friendly enclosure. The sky, or more appropriately, the ocean floor, is the limit with the Keeley Electronics Hydra.Stereo high-fidelity Reverb and Tremolo effects pedal. Dreamy and accurate-sounding Spring, Plate and Room reverbs. Vintage-voiced Harmonic, Vibrato and Sine Tremolo. Onboard or remote tap tempo. 3 footswitchable presets. Smart Alt Controls for Shimmer, Spring Age, Room/Hall size. Infinite hold for reverb trails. Expression pedal can be assigned to any knob. Effect Order, Reverb or Tremolo first, switchable on the fly. True bypass or trails switchable on the fly. 9V DC, 115mA ultralow-current design. Made in the USA.