"VoiceTone H1 adds one or two voices of rich, realistic harmony to your voice. You can use the key selector to dial in harmonies to fit a song, while the cool guitar-sensing feature keeps your harmonies in tune. Although VoiceTone H1 fits the form factor, to call it a stompbox would be misleading. As a member of TC Helicon's VoiceTone lineup, VoiceTone H1 is strictly studio grade - complete with a clean, quiet mic preamp and studio-quality A/D conversion. So give your backup singers the night off. You've got it covered with TC Helicon's VoiceTone H1."