TC Helicon VoiceTone Harmony-G XT Vocal Effects Processor - BlackThis is a Pre Owned TC Helicon Harmony G XT in Excellent Condition. It allows you to sing 3 Part Harmonies by creating (2) harmonies in addition to your voice. It creates Harmonies based on the chords that you're playing on guitar. 3rds (major or minor) 5ths stacked 4ths whatever you play will create the intervals of your vocal harmonies. You can choose harmonies ABOVE or BELOW your voice. You can save and store 10 selectable Presets. Built in effects