John,
I am going to have to agree with Herb on this one, record your audio in the Real Band DAW which you already have as a BIAB owner. The beauty of Band in a Box is that that Real Band will open a BIAB file, once you have your instruments and song in place.
But record the audio on Real Band to a mono track by right clicking on the number of the track and selecting mono as your source. Also go into options/preferences/audio and select your input channel. (Normally left or right.) All screenshots below.
Another indispensable free tool is Audacity, which allows you to do a lot of nifty auto editing after creating a file on a track in Real Band and exporting it (rendering/saving track to file).
You can also load the free G-Snap plug-in to both Audacity and Real Band which is a great free pitch correction VST. Just google audacity and G-Snap and follow directions. Load/save .dll into both Audacity folder and RB folder. To load free VSTs in Audacity, follow instructions on Audacity website. It is really easy.
To load VSTS in Real Band: If you click on the triangle beside a track in Real Band it will open a dialogue called edit VST which will allow you to add your VSTs of choice one time, and then remember them forever. This is a stage you should master in your recording career. This is where it all goes down.
The most frequent audio editing tool I use in Real Band is gain change, and the most frequent tools I use in Audacity are compression and normalization.
Also, if you are ever trading vocal files between one DAW and another and you get the chipmunk effect, you simply have a sample rate issue and Audacity will fix it for you. Just open that .wav file and in Audacity and save it again as a Windows .wav (if you are using windows) and it will now work in any scenario--at least to my experience.
If you get used to all of these tools they will change your life.
Have fun.