TC-Helicon does it again with the 1U rack-mountable VoiceWorks Harmony FX Voice Processor. This all-in-one performance tool includes pitch-correction and harmony generation at the touch of a button.
This is a great way to get natural-sounding four part harmony.
Use it along with your Band-in-a-Box for live performance or practice. VoiceWorks provides up to four voices of natural-sounding harmonies, real-time pitch correction, thickening ⁄ doubling, dynamic processing and effects.