Zplane's Veiklang Instant Harmony
https://products.zplane.de/vielklang
will do the what you ask very easily. It isn't as good as Melodyne but it is better than the harmonizer that comes with BiaB. It is also a lot cheaper than Melodyne and unlike Melodyne it will automatically give you up to 4 different parts. I have this one and its not bad. I use it in Sonar so I don't know if it will work in BiaB or RB.

Also if you google/bing vst harmonizers you will find a number of free ones. I have no experience with any of them but you may want to try them.

Good luck.


The bumper sticker said "I'm a veterinarian, therefore I can drive like an animal".
Suddenly I realized how many proctologists are on the road.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware