Electro-Harmonix HOLY GRAIL NANO Digital Reverb PedalThe Holy Grail Nano from Electro Harmonix is a compact digital reverb pedal that features three different reverb algorithms: Spring, Hall, and Flerb. The algorithms were designed and tailored for the electric guitar, but work equally well with most instruments and voices. A three position switch lets you choose the reverb style and a Reverb knob acts as a wet dry control. The unit is enclosed in a compact, rugged die cast chassis, and comes with a