Spring/plate-style reverb w/ fuzz that becomes huge synthetic atmosphere creator at high settings; adds depth to instruments; unique Altitude control adjusts reverb gain for wide open, distorted ambience; multi-function Verb control adjusts reverb size and wet/dry mix, and at max reverb is much louder than clean signal for powerful walls of sound, Dark / Light toggle selects between dark cavernous reverberation and bright, splashy, drippy spring reverb; Vol control adjusts output volume which allows Reverberation Machine to be louder than unity gain; Lifetime Guarantee; handmade in Queens, NYC, USA