I believe you have a couple of options.

1- if you are on a PC then input you song into RealBand and regenerate those measures that do not harmonize correctly. You may have to do this a few times. Note that I do not use RealBand so someone else will have to fill in the details on how to do this.

2- transfer you song to a DAW and use MIDI to write your Cello part. There are a number of Cello VSTis available ranging from free to very expensive. Google/Bing cello vst and you will find them.

Good luck.


Why is it that doctors call what they do 'practice'?
If flying is so safe, why do they call the airport, the terminal?

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