OK... let me splain this again.
Yes you can do what you say...easily.
However, take a project in BB..open it in real band to render the real tracks. Now you have a "you got what the program decided to do" scenario. It is a great track most of the time but it will not be what YOU might want. If you decide to render that to midi so you can edit it, that can be done BUT it is not possible to get the midi track to sound anything like the rendered one. I have tried several different ways to accomplish this...all without success. I can get a midi track but it is not even close to what the real track sounds like, it is a very midi sounding track.
I wanted to do some editing to a real track that BB exported as audio on a piano sample. Convert to midi did convert it to midi, but it sounded nothing like the original. My plan was to apply a synth piano sample I have to get a better sounding piano part but with the notes and articulations in the original rendered part..... could not make it happen.
I have tried, I have called BB support, and posted in their users forum and no one had a satisfactory answer. Tech and the advanced users agreed with me, that what I wanted to do was not currently possible in any way in the current versions of BB.