For multiple audio tracks and mixing of such you may want to look at Realband. This comes free with BiaB and is a more conventional DAW based software with 48 tracks that can be either MIDI or audio. It also supports the song generating features of BiaB.
Your audio track should be near the bottom of the BiaB mixer applet I believe.
Thanks for the quick response.
What you say brings up a related question: why the two programs? But first I'd like to get straight with BIAB.
I am deducing from your answer that there is only one track for recorded audio in BIAB. Correct?
Moving on, I am thinking of two scenarios:
1. In BIAB, you record some audio like singing or an instrument part, then re-generate the BIAB song to see what the various re-generations sound like with that one audio track. When you get a combination you like you can export it (details on that later). For now, no other program required.
2. You could also do this with a more complex audio track -- any number of things mixed down to a single track -- made with another program (is that where Real Band comes in?) and importing that track into BIAB as "the" audio track; again, the idea being to try various re-generations with a fixed audio track.
Is this the basic idea of "the" audio track in BIAB?
If so, why not just start out in Real Band since as you say it also supports the song generating features of BiaB?
Perhaps more simply: why does the record audio feature in BIAB exist?