TC Helicon DuplicatorDUPLICATOR Ultra Simple Vocal Effects Stompbox with Doubling, Reverb and Pitch Correction Ultra simple studio quality vocal effects stompbox for doubling, reverb, and pitch correction gives you stand out vocal effects anywhere you perform Three classic doubling sounds with tight, loose, and octave up and down options Vocally tuned reverb places your voice in the perfect musical space Effortless auto chromatic pitch correction helps you sing in tune