Electro-Harmonix Holy Grail Electro-Harmonix, Ele-Hamo, Reverb This is a rare, old model, the same as the one used by Red Hot Chili Peppers and Saito from UNISON SQUARE GARDEN! It was working when I used it, but the sound output is unstable, and I can't reproduce the conditions of the malfunction, so I'm selling it as junk. Thank you!