On BIAB 2017 for Windows, I've got chords to a song entered and using a RealTracks style. Now I want to make an mp3 or wav file of the result.

1) I mistakenly used the RecordAudio button, so I guess it rendered the song to a file somewhere, but included the laptop's microphone. I can see now that this is how to record yourself on top of a BIAB backing track, but that's not what I wanted.

2) Then I found the WAV button, which is probably what I wanted in the first place, but using that now that creates a WAV file of the recording I mistakenly made in the first attempt. I guess what I did first was make an audio version of the song that is now cemented to my chord chart.

How do I get back to square one? How do I uncouple the recording I made with the background noise (nose blowing etc) from the chord chart.

I just want to make a backing track to an audio file. Is there a tutorial or man section I should be looking at? I found the video tutorial "Rendering your Band-in-a-box song" under the Beginner tutorials.

Thanks....