TC Helicon Voicetone H1
This is simply the most natural sounding & affordable vocal harmony processor you’ll find. Choose one or two voices in a variety of harmony styles above and/or below your lead vocal. Getting it started is simple: guitar players can plug right in and behold the auto-key sensing magic. Otherwise, just set the key and start singing.
• Plug in your mic, plug your pedal into the mixer & set gain.
• Select the harmony style.
• (That’s it.)
Of course, you can always change the style or the amount of harmony, but you shouldn’t need to unfold the manual unless you’re making a fire.