HangdogCat:

Noel has 2 great suggestions.
However, there IS a way to keep the whole project in BIAB, depending on which version you are running.

Any of the newer versions that has the ACW will work, and Version 2013 with its "Performance Track" is especially suited for this.

I recently went through a similar project and it worked out great.
The gist of it is this, you use the ACW to load the .wav file to BIAB. That .wav file then becomes a "Performance Track" and is filed in the same folder as your BIAB song, and with the same name, with a suffix added.

You can then play the .wav file along with any BIAB style.

Let us know what version you're using and perhaps we can step you through it, providing you still want to do it all in BIAB. Otherwise, just use Noel's suggestions.

Good Luck!
LLOYD S