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.


Life is short so make sure you spend as much time as possible on the Internet arguing with strangers.

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