Bootcamp is a great way to run Windows software on the Mac, but I have to assume that you are asking about Crossover because you don't have (or don't want to buy) a copy of Windows to run on it.
Crossover is pretty amazing but it does have it's limitations. I don't know if you're aware, but Crossover is a commercial program based on the free open source WINE project. If you want to try it out BIAB without Windows, and without shelling out for Crossover maybe you should give WINE a try.
Installing Windows programs in WINE can be a little more involved than with Crossover, because Crossover includes a sort of "Install Wizard" type program that helps with some of the more difficult Windows installers (like Microsoft & Adobe). However there is a good chance that the BIAB install may go smoothly with WINE.
Having said all this, I now use WINE to run Office 2010, and some proprietary Windows software that I need for work on my Mac, I have in the past run BIAB 2006 under WINE, and it ran well, but this was long before RealTracks when BIAB was mostly a MIDI program. WINE does support Core MIDI, and audio (although live playback is only 16 bit you can still export higher bit rates and use the audio files on the Mac side).
The latest Mac version of WINE can be found here :
http://mike.kronenberg.orgOnce installed it puts the WINE program into your Applications folder, and creates a folder in your home folder which becomes a virtual C: drive. from then on double clicking an .exe file launches WINE and runs the program as it were a native Mac program (hopefully).
Hopefully this helps.
Worth a try anyway, the price is right.

- Jay