How to create a score for an alto sax chorus using BIAB and the free MuseScore 2 editing tool
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1.  Open BIAB, Set Options->preferences->arrange->concert pitch adjust->+3
2.  Enter the chords, tempo, style
3.  Click on the icon tool, mid and save *chords_from_BB.mid
4.  Save chords in an sgu file
5.  Close BIAB
6.  Open MuseScore 2 
7.  Select file->open *chords_from_BB.mid
8.  Select edition->instruments
9.  Add alto sax line. Remove visibility of lines for all other instruments played in the chords 
10. Now the scores for all these other instruments are no longer seen but only heard when played by MuseScore 2
11. Edit the chorus to the alto sax line, play it along with the chords, and modify if needed 
12. Export score to a pdf file for printing
13. Save alto sax chorus and chords in an mscz file 

How to create a quality mp3 file
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On MuseScore:

1. Open mscz file from above
2. Verify tempo. If a modification is necessary, recover visibility of all instruments and click on line 1, first note and change tempo via Alt+T key.
2. Export midi file *from_MuseScore_for_mp3.mid
3. Close MuseScore
4. Use "Switch : http://www.nch.com.au/switch/fr/ ( for personal use )" to obtain an mp3 version of *from_MuseScore_for_mp3.mid.