Boss VE-2 Vocal HarmonistCombining sophisticated sound with simple operation, the VE 2 Vocal Harmonist delivers a complete effects solution for all singers, particularly those that perform with guitar. This portable, battery powered stompbox has everything you need to create polished, studio quality sounds everywhere you sing, from concert stages and street performances to practicing and having fun at home. The VE 2 magically creates beautiful harmonized vocals that follow