The Electro-Harmonix Voice Box pedal generates 2 to 4 part vocal harmonies in the same key as the chords being played on your guitar. With the Voice Box harmonies move in a smooth human-like transition rather in steps. Electro-Harmonics offers more variety in harmonies. Electro-Harmonix adds some weird voices like a whistle male-to-female and female-to-male voices and independent reverbs on dry and harmonies.
